Help M8 staying in sleep mode

[Warrior94]

Hey all, I picked up my M8 through Att back in june. My phone just started "locking up" per se, where it will not come out of sleep mode and I have to do a hard rest. It's happened twice today.

Never been wet, never been dropped, it's in a nice UAG case and haven't installed any new apps in a few weeks.

100% bone stock also

I hope i don't have to use HTC's 6 month warranty, as I don't want a refurb unit

Any idea's on a cause?

 

[olbriar]

Do you think the problem started after one of the recent OTAs? Sometimes it takes a factory reset to settle in major updates.

 

[Warrior94]

I haven't gotten an OTA yet, It's still on 4.4.2 that came on the phone.