Hello, I'm new to the forums and this was the first place I checked when I started having problems with my Atrix. I bought it two days ago and at least twice a day it'll shut off and stay off for no reason in particular. Pressing/holding the power button won't turn it back on, and I have to physically remove the battery and then put it back for it to work again. The phone is fully charged and it's still at factory settings (save for a few standard apps I downloaded). When I first took it home from the store it worked for about an hour, then shut down so I assumed the battery was low and charged it for a bit. After a while there was no response so I popped the battery out and as soon as I put it back in it turned on without a problem. I'm thinking about taking it back to AT&T but it occurs so infrequently that it'll be hard to explain (unless I wait for it to happen then drive to the store). Any help would be greatly appreciated. Thanks!