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wifi fallback issue on SGH-i727????

Hi,
Just wonder if anybody is experiencing the same wifi fallback issue on the SGH-i727?
Basically, the phone doesn't automatically fall back to the previously added wifi network from LTE/4G when the screen is off. To get around that, I'll need to hit the power button once every time I enter the wifi range. When the screen is turned on by hitting the power button, I will see the 4G/LTE being replaced by the wifi icon very quickly. After that, it will then stay connected to the wifi network regardless whether the screen is on or off.
I was able to confirm this issue by monitoring the app traffic before and after I turned on the screen.
Without turning on the screen in the wifi range, the phone will stay on the 4g/LTE network forever even though the previously added wifi network is available.
I have already tried out different routers and it's still the same. SSID broadcast is on. I am thinking if there's a bug with the phone. Note that on my phone, my "Wi-Fi sleep policy" under the advanced menu of the "Wi-Fi settings" is always set to "never". Also, it's a stock ROM, nothing is modified at all.
This issue has never happened on other phones. What you think? Am I missing anything here?

After playing with it more, I noticed that the phone will never do the wifi handshake when the screen is off.
I tried turning off and on the wifi in the Wi-Fi settings. If I turn off the screen quickly before the phone gets connected to the wifi network again, it *will* remain unconnected until the screen is turned on again. =(

Did you go into the advanced wifi settings and change the wifi sleep policy?
Sent from my SAMSUNG-SGH-I727 using XDA App

No, I didn't. I've never touched that setting. The "Wi-Fi sleep policy" is always set to "never".
My phone can still be connected to wifi when the screen is off, so it doesn't seem related to the "Wi-Fi sleep policy". The problem is only that it won't do any wifi connection handshake during screen-off.
Am I the only one having this issue? I guess that's more of a software issue rather than a hardware issue?

Have you tried the AT&T wifi app? It automatically turns off and on wifi as needed

No, that doesn't help.

Yes, I do realize I'm bringing back a thread from the dead, but...
I just got a Samsung Stratosphere (SCH-i405 -- a CDMA-1X/EVDO/LTE Galaxy S phone) and it does EXACTLY the same thing. It's ironic, on the Stratosphere they added a bit of fun that CONSTANTLY lets you know there's networks (which I had to disable), but it doesn't connect to the wifi networks I do have in there until I turn on the screen I guess that's just how it is; at least it doesn't kill the wifi once it IS connected.
If anyone knows a programmatic way to bypass this, I'd be interested, and I could write up a wifi app to implement the solution. I'm guesisng it's a behavior of the drivers though and would take some custom ROM or something to fix.

You could always try to use tasker for automatically connecting to the wifi using radio antenna or maybe can't remember if possible by identifying certain wifi spot.

[Q] T-Mobile Tether, data keeps failing randomly

Hey,
I have a Nexus 5 that is set up to basically act as a router using wireless tethering. I live in an area where I constantly have full-blast LTE that is usually above 30Mbps. For about a month, everything's been great until this last week. Now, every few hours my data connection gets killed completely after anywhere from a few minutes to a few hours after tethering has been running. Data stops working on all tethered devices as well as the Nexus 5. Entering airplane mode and then resetting the WiFi tether fixes the symptoms, and if that fails, restarting fixes it.
I've disabled wireless_tether_dun (sp?), switched to IPv4 and I sometimes use a VPN that passes through all network traffic through the VPN. Even with VPN disabled, the data drop keeps happening.
I know there are so many things that can be going on, but has anyone else noticed this recently? I'm wondering if it is a hardware issue, a signal issue, or perhaps T-Mobile has changed something on their side of things that is killing my somewhat obvious abuse of their network.

x2
jondwillis said:
Data stops working on all tethered devices as well as the Nexus 5. Entering airplane mode and then resetting the WiFi tether fixes the symptoms, and if that fails, restarting fixes it.
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I am having the exact same issue -my post- in a completely different place, only I have been assured it is completely fine to use my phone on the network in this way. Did you ever find a solution to this?

WiFi issues

Anyone else with WiFi issues? 90% of the time I have no problems but 10% of the time it seems the connection hangs. Data transfer will pause and resume 30 secs or a minute later. I have tested this with speed test and was able to reproduce. Happens on both my 2ghz and 5ghz networks. I am rooted but I'm going to do a factory reset to see if issue persists. I do know it's not my WiFi as my other devices have no trouble. But this is quite annoying.
Sent from my HTC6525LVW using Tapatalk

murryrulz said:
Anyone else with WiFi issues? 90% of the time I have no problems but 10% of the time it seems the connection hangs. Data transfer will pause and resume 30 secs or a minute later. I have tested this with speed test and was able to reproduce. Happens on both my 2ghz and 5ghz networks. I am rooted but I'm going to do a factory reset to see if issue persists. I do know it's not my WiFi as my other devices have no trouble. But this is quite annoying.
Sent from my HTC6525LVW using Tapatalk
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Are you by chance using an Apple router or access point? For some reason, they don't seem to play well with Android devices, including my M8. I've had a similar experience with 4 Android devices and 2 different Apple routers. The devices continuously disconnect and reconnect.

No I'm using an Asus ac66. The funny thing is the connection doesn't drop. It always says connected. The data just stops flowing and then starts again. For example I'll run a speed test and the download will pause then start up again. Very odd. Never had a phone do this before
Sent from my Nexus 7 using Tapatalk

I've got an Apple Airport Extreme. I also have several Android devices. Have had many that I no long have or use. I've never had any problem with my wifi on any of them. I have to wonder if your problem isn't related to something else. Or, possibly your router needs to be replaced. Might be a matter of settings too. But, like I said, I've never had any problems with mine.

Within the "Advanced Wi-Fi" settings there is an auto-enabled option called "Wi-Fi Optimization" which minimizes battery usage when Wi-Fi is on. I assume this monitors for extended periods of inactivity (screen off, no active downloads, etc.) and temporarily disables/hibernates Wi-Fi activity.
I've kept this option enabled and haven't had any issues so far, but maybe you could try testing with/without this setting enabled? Another thing to try would be checking highly-used radio channels in your area with an application like InSSIDer and making sure your router is broadcasting on a low-use channel. I see no correlation with the radio channel and your new M8, but it's worth a try

insertnewsn said:
Within the "Advanced Wi-Fi" settings there is an auto-enabled option called "Wi-Fi Optimization" which minimizes battery usage when Wi-Fi is on. I assume this monitors for extended periods of inactivity (screen off, no active downloads, etc.) and temporarily disables/hibernates Wi-Fi activity.
I've kept this option enabled and haven't had any issues so far, but maybe you could try testing with/without this setting enabled? Another thing to try would be checking highly-used radio channels in your area with an application like InSSIDer and making sure your router is broadcasting on a low-use channel. I see no correlation with the radio channel and your new M8, but it's worth a try
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I have the same issues. and ive turned off wifi optimizaiton, ive set my wifi control frequency to 149, ive tried to switch between 2.4 and 5ghz. i feel like my issue is with the phone not picking up the wifi signals very well... we live in a brick house, and the asus ac68u sits right in the middle of th house, and my room is only right around the corner. everyone elses phone picks up 5ghz or 2.4ghz frequency fine in my room, even my gf's M8 (we bought ours from verizon same time for the deal). i literally get wifi in my rom 10% of the time or its choppy and slow. so everytime im in my room i have to switch to cellular :|

38R Wi-fi connection issue

Ever since my phone got the XNPH38R update I've been having an issue with wi-fi
If I connect to wifi it works fine but as soon as I lose the wifi signal it can't seem to reconnect to the same wifi without rebooting the phone. Its especially annoying when I walk to get the mail or come home from anywhere.
I've tried manually connecting to the wifi after being disconnected in the android wifi settings menu but it doesn't connect until I reboot my phone.
I'm running the 64GB oneplus one on t-mobile in the usa.
Any suggestions?

jkentj said:
Ever since my phone got the XNPH38R update I've been having an issue with wi-fi
If I connect to wifi it works fine but as soon as I lose the wifi signal it can't seem to reconnect to the same wifi without rebooting the phone. Its especially annoying when I walk to get the mail or come home from anywhere.
I've tried manually connecting to the wifi after being disconnected in the android wifi settings menu but it doesn't connect until I reboot my phone.
I'm running the 64GB oneplus one on t-mobile in the usa.
Any suggestions?
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I've had this issue on CM, except it'd work when I manually connected back to the wifi - I believe it's an issue when the phone goes to sleep it's failing to resume wifi connections.
The only thing I could suggest is try downgrading back down, or doing a clean re-install, and reporting this issue on CM's jira, so they can fix it.
https://jira.cyanogenmod.org/
I'm on OMNI now, so I can't really help you out, but do try unticking that 'wifi optimization' option, or perhaps using a tasker profile to turn off and on wifi whenever the screen display turns off and on respectively (at the trade off of loosing connection, so you won't be able to download stuff while the phone's off).

i have the same problem..

WIFI problems

Got a new S8+ yesterday.
Everything is fine except WIFI, it keeps disconnecting all the time, going on and off, until it finally stops working...
I tried removing all background signal checking and all unnecessary options, and also I did reset it to factory twice, but the problem persisted...
I have my former S7 Edge on the same network without problems...

I am having the same issue. Disconnect then reconnect every few min.

I had one disconnect this morning but it transfered to the 2G instead of the 5G.
Sent from my Samsung Galaxy S8+ using TapaTalk Pro

Check your network settings; it may be switching between LTE and WiFi to "conserve energy, buy having the strongest connection." I have had that issue in the past with other devices.

bigbad614 said:
Check your network settings; it may be switching between LTE and WiFi to "conserve energy, buy having the strongest connection." I have had that issue in the past with other devices.
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Click to collapse
Tried that already, but it is completely disabled..
In fact
Nearby Device Scanning is OFF
Wifi Calling is OFF
Location is PHONE ONLY
Smart Network Switch is OFF
Network Notification is OFF
Hotspot 2.0 is OFF
Keep WIFI on during sleep ALWAYS
and it is still happening.....

When I was first provisioning the device at home I was running it off a Ubiquiti AP Pro and kept getting disconnected. I took it off WiFi and ran the setup on 4G LTE only and connected to my WiFi after. I run Google Fiber and did some 5GHZ speedtest and was never less than 600mpbs up and down. Absolutely 0 chance the initial issue is my network at home. I haven't seen it disconnect since the initial setup but that does worry me a bit. I'd wipe the network profile and set back up.

Probably unrelated but I've found that the 5Ghz WIFI strength on my S8 5.8inch is terrible. The 2.4Ghz is fine though. Compared to my Pixel the 5Ghz is on average about 1/3 the connection speed at same range as the pixel and has much lower strength signal (testing with WIFIAnalyzer). If I cup the phone with 2 hands in landscape mode (how I normally watch videos) I often lose my WIFI connection completely from the 5Ghz network here.

Me to having same issue with WiFi disconnect automatically getting irritated from that
How to fix this guys

Had the same problem on mine. Setting the IP address to a Static IP fixed the issue.

Try going to settings, backup and reset, reset network settings. See if that works.
Sent from my SM-G955U