The only blank screen issue I have had with the phone when I was on stock was actually caused by the voice search function when I was using the play store. Right after I finished speaking it would process and go black and I would have to reboot. Once the play store updated, the problem went away.
Yeah. This for me, is as listed in the main post.
The only time I really noticed it was when my phone would set for hours at a time, and I then had to use it, and when I did go to use it I came to a black screen right off, so I'd have to restart it before I did anything else.
Sometimes it would happen daily, other times I'd go 2-3 days before it happened, but it was still frequent enough it got annoying.
Everything works fine, the apps, the system, etc..., just get the black-screen issue.
I was actually glad to see someone else having the "exact" same issue I haev been having since I bought the phone, that and the fact it seems to be related to something with the stock roms somehow is at least a step forward and a relief to know I'm not the only one and I'm not going crazy....well OK, I'm not the only one
I'm truly not sure what causes the issue even now. I do know however that switching to a non-stock rom does fix the issue it seems.
It's kinda one of those things that's REALLY hard to track down. Honestly I wish I COULD track it down, so I could use stock if needed and/or someone could possibly put out a fix.
For now I am stuck with using a non-stock rom, unless I wanna deal with the black-screen lockup sorta issue