I've had my Moto X for about a month.
Lately, it will freeze when I try to back out of an app using the back key. Can't do anything with it and the power key will not respond. Then the screen goes black.
If I set it down or put it in my pocket for a few minutes it will then have the lock screen visible and back to normal.
It does this now about once a day.
I have my suspicions about Nova launcher but have no direct evidence. Have not tried to use the stock launcher either which I guess I should as I walk through the process of elimination.
Any ideas?