Signal problem with stock rom J7 2015 - Samsung Galaxy J7 Questions & Answers

i flashed marshmallow stock ROM in j700F 2015 but there is some problem in it. My phone is now loosing its signal frequently but status bar is still showing the range as full.then i have to put my phone on flight mode and after turning off flight mode i got my signals back for some time after that i have to do the same.
can anybody help!!!!

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[Q] S2 HD LTE Reboots (Shv e-120k)

Friends plssss help me
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it restarts when the battery percentage goes below 90% and when i open an application
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LG F350L boot loop issue

i flashed this rom
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edit:
i restored stock rom but this problem has started there too, is my battery gone or my device is bricked, it works with charger but not working without that (
My phone got stuck at 90% while flashing D838 ROM. Now it does not open anymore - only the LG logo shows off and on and can no longer be detected by my PC. My phone now is on a 'bootloop" mode.
Any help from our Masters out there?
TIA.

Touch Issue Yu5010

Hello Friends, I have a Yuphoria out of warranty.The display and digitizer were replaced 8 months before.The phone was idle switched off since then.Now when i tried to start it, it went into boot loop so i flashed the android version of a rom.The network was off in this rom,and navigation bar didnt work.So i reverted back to stock firmware ,the touch was working based on 5 seconds intervals , navigation bar didnt work but network was restored. Guys if you know any solutions please help me .

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My device is almost 6 years old. All this time, the wifi is working properly until now. The issue with the WiFi only happened last month. The WiFi seems to be buggy, turning on and off. Sometimes it does not turn on at all. So I tried restarting then a bootloop happened. I flashed all the stock rom starting from Android 5.1 to 7.0 but still, the bootloop occurs. Please help me, I need this device for online class. Thank you!
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HELP ON WIFI (LENOVO A5000 4.4.2)

Hello everyone! Ive got this problem for quite some time now. My phone lenovo a5000 android 4.4.2 had this weird problem on its wifi. it suddenly hanged up while I'm browsing on facebook, so what I did was to reboot my phone but as soon as it boot up, the wifi scanning animation on its notification bar doesn't stop scanning for minutes and it will hang up again making my phone very unresponsive, screen doesn't work, volume buttons doesn't work, whats only working is the power button to be hold and reboot again. but after booting up, same problem would occur. brought it at a local service center and they managed to fix this up but only for a few days, the problem went back again. the only workaround I've been using until now is enabling the airplane mode so that wifi would be turned off automatically as it boot up because when i ticked the wifi on notif or on the settings app menu, the phone literally freezes so i have to turn wifi OFF all the time to use the phone (offline). I've tried many fixes regarding this issue but none of them worked
here are the methods that i have tried but failed
https://forum.xda-developers.com/t/fix-cant-turn-wifi-on-you-are-missing-this-file.3007540/
i know my phone is kinda old now but i still use it for my sns and emails, that's why i want it to be fixed
i will provide version info of the phone in case needed
Model number: Lenovo A5000
ANdroid version: 4.4.2
Baseband version: A5000.V02, 2015/03/03 11:43
Kernel Version: 3.4.67
Software Version: A5000_S002_150306_8G_ROW
Hardware Version: M025
rooted and not running on any rom
thank you in advance!

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