[Q] Flickering screen and rebooting on a brand new H950??

Hello

A friend of mine purchased the H950 from qualitycellz on eBay, when he start using it, he noticed that the the phone reboots randomly and screen sometimes flicker.

I've CSE flashed 950PR over the ATT version cause I thought it might be software -related, but the problem continues also on the PR version...

any Ideas?

thanks