phone keeps rebooting

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phone locks up and reboots....then comes on and locks up and reboots...itried factory reset and deleted my sd card with no luck...any ideas

Are you rooted? After what did this start to occur?

Sent from my PC36100

i was going thru the new root method for 2.2
i got n error after the toggle sirplane mode on and off. after that the phone started going on and off.

took to sprint store. they looked at it ...did everything i tried basicaly and ordered a new one. it be here monday or tuesday...... talk about sucking!!! only thing worse then waiting for it to come out...is after you get it ...it f's up and you have to wait for new one. what i dont get is it is covered under warranty, they have evo's in stock yet i have to wait for new one to be ordered.... they handed me back my old phone so it not like they sending it in to see what the issue is