Motorola Atrix 4g reboots itself I've just got a new Motorola Atrix 4g and have experience random reboots of the phone, this generally happens when it is in my pocket or otherwise unattended.
Usually during the work day when browsing, playing games, listening to music or using the GPS it behaves itself.

Anyone got any ideas?
Sounds like a hardware issue.  I suggest promptly replacing it with your carrier before your return grace period is up (30 days with AT&amp;T, for example.)  You will need to do this at the same store where you purchased the handset.

I have the exact same problem with my new Atrix.  Unfortunately (for me) I unlocked its bootloader, so AT&amp;T is refusing to honor the warranty.  I sent it in to Motorola for repairs, but it's still doing the same thing (Moto was nice enough to re-lock the bootloader, but AT&amp;T is still not budging.)  In my case, I have a feeling that it's either damaged battery contacts on the phone, or perhaps a faulty battery itself.  I am planning to send it to Motorola again (on their dime this time) to see if they can fix it for real this time.