[Q] Android L 5.01 lock screen reboot topic

I have a single issue when the phone goes to "sleep" mode it reboots.

so i set the lock screen time out to 30 minutes, sure enough phone is stable and useable, if i set the phone down for 30 mins as soon as the screen goes dark, it will reboot

same as if i turn it on, when its on the lock screen after booting, if i dont touch it for a few seconds as soon as the screen goes dark, it will reboot. this is now my ONLY issue

is this a known issue? i cant find anything for a fix for it. help is appreciated.