Third N910T replacement; something stealing app focus

I'm about to receive my third warranty replacement for the numerous problems I had with my Note4. Most of the problems are fixable (camera, GPS, etc), but one problem is bad and I don't see a simple solution.

Something seems to be intermittently stealing the focus from my app (I believe). So, if I'm watching YouTube, it randomly pauses because it thinks I've switched apps. If I'm recording video, it randomly stops, because it thinks I've switched apps. If I'm playing a video game, it pauses while I'm playing until 'I return'. If I go to the app-switcher, sometimes it closes randomly before I select which running app to switch to.

I actually bought a new SD card (64GB wasn't really doing it for me, anymore, anyways) but the problem persists. The phone does seem better behaved before all my apps repopulate (although there's not much to do on the phone before the apps are back), so I suspect it's an app, but I haven't heard anything about this sort of problem on any website or forum.

Lastly, the problem may have started around the time of the StageFright patch in August, but a lot of apps also updated around that time.

I'm stock without root (maybe in the future), although I always disable T-Mobile bloatware like DT_Ignite. Any help or suggestions are appreciated. Thanks in advance.

Did something stupid. gpt.bin

Hi,

I think i did something stupid.
I want to sell my moto x and therefore i tried to relock it.
Somehow i was a little drunk and flashed 4.4.4 on my moto with 5.1.1. Unfortunately i used some instructions which also included flashing gpt.bin. During the process i realized that this might be a bad thing. Now all i can boot is TWRP.

Any hint how to get a proper Lollipop running on the phone to sell it?

Can´t find any 5.1.1 gpt.bin and the other files needed to flash with fastboot...

thank you very much in advance!

swap internal memory with sdcard or something on cm 12.1?

Im on D620 with last stable build of cm21.1 by nikita!
is there any solution for internal memory? or by any change your app data like whatsapp, fb, soundcloud can b placed on sd?
looking forward to suggestions, thankyou.