My old phone did this on UMA and eventually started rebooting while just sitting on the desk. It eventually died. The warranty swap phone I received only does this using UMA with my Verizon Fios router. I run a Linksys behind the Fios router so it is fine now. I'm running OS 4.2.2.184.
If the phones are being exchanged, with no change in behavior, check anything that is consistent from phone to phone. Such as:
Wifi router
Other devices like bluetooth headsets, or 2.4gz cordless phones used nearby
SIM card
Media card
Battery
OS
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