Has my phone been hacked? - General Questions and Answers

OnePlus One running Android 5.1.1. This evening I noticed the attached message in my notification shade. There is no "NPO" app visibly installed on the phone and I have no knowledge of a "Chromecast-Matthieu" in my vicinity. If I try to cast through an app I am familiar with (Youtube, Pocket Casts) I do not see that device. If I try to pause the cast or close the notification, it restarts and/or reopens within a few seconds. I can turn the WiFi off and it goes away, but turning WiFi on again it reappears. I have rebooted the phone. The apps that got updated recently seem to be trustworthy. I do not have a Google Home device. I guess that is a renamed Google Cast app (?). I uninstalled that and it had no effect.
How freaked out should I be about this? What can I do to fix it? Can cast device names be hidden like SSIDs?
Thanks,
David

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[Q] Gmail & Youtube apps; no longer multiwindow enabled

Has anyone else had this problem just recently? I noticed that a new app called "Google Settings" randomly appeared on my Note this morning and since then, Gmail and Youtube are no longer able to go into multiwindow mode. I tried using MW Manager to fix Gmail... but it looks really weird in fullscreen mode. There's just this huge empty space on the right side while all the content is squished on the left side, as if it's still in windowed mode. I have not tried MW Manager for Youtube, yet.
I am running on stock Jellybean 4.1.2 and I'm rooted. I have no idea what's going on, since I've only had the tablet for 2 weeks and I barely downloaded anything (just some apps like LectureNotes and Layer Paint).
Any info/suggestions is greatly appreciated! Thanks!
Sorry I have no idea why your youtube isn't multi Window anymore mine still is but I did notice the Google settings app randomly appear this morning, I was changing the lock screan apps at the time when it happened don't know if that had anything to do with it?
Update: seems google has installed a useless settings app on all of our devices overnight personally I dont want or need this so I would like 5o disable it but it isnt a listed app in application manager.
http://lifehacker.com/5987333/google-settings-gives-you-convenient-access-to-other-google-apps-settings-on-android

Bizarre black box lorem ipsum bug

Has anybody ever seen anything like this? I'm experiencing a black box popping up maybe 20 seconds or so after booting that is unclosable with lorem ipsum text in it, here are some screenshots:
[xda won't let me post links yet so bear with me and fill in the rest of these urls]
imgur /LYCMosA.png
imgur /fsh6nWh.png
imgur.com /tde44HA.jpg
The box cannot be closed, and anything above it doesn't respond to touch input, but everything below it can still be used (like the shortcuts to chrome, contacts, etc. in the last screenshot). This box persists everywhere, including the lock screen.
Additionally, when I go to the lock screen the screen starts turning on and off rapidly, forcing me to reboot by holding the power and volume down key into maintenance mode.
I am able to start the phone in safe mode with no problems (safe mode disables all apps that aren't samsung or google), making me believe it's a third party app that is causing the issue and not something in android. But before I begin the awful task of uninstalling apps one by one to see which is the one that's causing the issue I figured I'd turn to reddit for help.
Additional info: I'm on verizon, the phone is rooted and I'm on 5.0.2
Flash with stock 5.1.1 ROM via odin.
Update: If you're reading this from the future it was cerberus, the security app. Really ****ing pissed because I uninstalled just about everything else because I didn't want to uninstall my security app until I had my phone back at my house (just tempting fate too much). Oh well, at least I've figured it out.

Issues with freezing Pixel 8.1

So, banking on the kindness of some like-minded strangers.
I'm having issues with a Pixel freezing.
OS: Whatever the latest version of 8.1 is in the UK as of 28/03/18 (can't be sure due to issue but I update ASAP)
Not Rooted
Running a custom launcher (Action Launcher)
When I boot the device, Android runs normally for about 30 secs, and then freezes. It still appears to be running, a couple of notifications show and will display the power menu, but does not respond to touch input. I had the 'show touch' feature in developing settings enabled, and the screen is still receiving touch ok so not a hardware problem as far as screen is concerned. I have booted into safe mode, and same result. Recovery mode operates as normal, but doesn't appear to offer anything of use. Also, as it freezes, a FC notification appears, but will be for different apps. I don't know for it's linked, but only after it froze I got a notification saying storage was full, I thought I had at least 1GB but can't be sure. Also, it happened first as I was attempting to share a photo from GPhotos to a contact in Allo. The other day I tried to take a video twice, and both times the system crashed when I pressed stop at the end of the video. Both times the system worked fine when I restarted.
If anyone can shed some light, or has managed to sort same issue, or can direct to a good thread (couldn't find one that helped) I would be immensely grateful, and will send kudos and good vibes.
James

Location problem

Over the last views days I've started to notice that when I unlock my pixel 2 the location icon appears in the notification tray when I start a app like XDA or Facebook the icon disappears and when I press the home button to go back to my home screen it comes back straight away. Has anyone else noticed this problem?
I've noticed the same since yesterday. Location icon shows up every minute or so. I ended up disabling advanced location.
I've disabled location completely. I'm guessing it's a Google app that is causing it but not sure which, the only ones I've updated recently are YouTube, health services, play music, Google and keep.
Edit
Looks like a issue with the Google app. I uninstalled it and the went back to normal, when I updated it the problem came back.
I had the same issue, turns out it was the Google beta app for me. I uninstalled it and reinstalled the stable version

Weird sound/song plays randomly

Hey guys! For the past few weeks, there's a random clip of a song that will play on my phone, almost as if I have a notification. But, there won't be anything in the notification bar. Sometimes, I don't even have any apps open when this happens. The "song" sounds like something from an Indiana Jones movie. It's maybe about 10 seconds long, give or take. I've tried uninstalling apps that I've downloaded right before this started happening, but it still happens. I've also tried installing an anti-virus (AVG, Malwarebytes), as well as a notification logger (nothing out of the ordinary) and an app that forces a refresh similar to a restart (Fast Reboot). It's driving me up a wall, but resetting my phone to factory conditions is a lot of work, so I thought I would turn to you guys to see if anybody else has a similar thing happening to them. For what it's worth, I'm running the latest Android OS on the Pixel 2 XL. Thanks guys!

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