Reminds me of the two Nexus 4's I got. First one dead in the box, second overheated after two weeks and mysteriously lost its IMEI and never had cell signal again. Worked fine otherwise, but stupid.
I'm still using the 3a, but I've broken the screen at least 4 times. I'm clumsy, but I don't think it's just my fault? That screen is ridiculously delicate.
However, once cracked, the hauntings begin. There are touch controls attached to the display that go haywire, and it would cycle through clicking buttons like Russian Roulette: it called the emergency line twice while cracked, and would just power itself back on when I turned it off. I finally bought a screen protector and haven't had an issue since.
Oh man, my buddy's P6P has a weird issue where it feels like the DAC is coming loose too (if the audio goes out he can press on a part of his to make it come back). Guess I got lucky as I'm still on mine.