I was getting random reboots from day one. I spent hours in the forums and tinkering with my phone... factory reset, clean battery, format SD, custom roms, overclocking, underclocking, you name it I tried it. Finally gave up and called Verizon, got a refurb the next day, and have had no reboots since. I am convinced it's a hardware issue. My advice is, if your phone is rebooting, don't waste your time, back up your stuff and call Verizon. This has been a known issue since the first week the DX came out and no one has found a fix yet.
Edit: sorry I just realized this is in the TB forum... saw one poster had a DX tho
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