My daughter had her first reboot ON HER WAY HOME FROM VERIZON when they changed her phone from BB to DX. She didn't tell me, then it started 2-3 times a day. She finally mentioned it to me as I also have a DX with NO issues at all (I have LPP).
Anyways, i called Verizon and they said it COULD be a battery issue. They mailed me an extended battery for free to see if that helped. Nope. So, we took her phone to Verizon where the tech did a hard reset. it completely froze then and was totally useless. He ordered daughter a "like-new" DX, over-nighted from Verizon and we received it yesterday. So far, her's works faster than mine! I added LPP when I saw that it seemed good and then I let her add a few apps at a time. This morning, all is well (knock on wood).
I want to add here tho, that my entire house (5 diff. kind of phones) and my in-laws across the street - ALL our phones have been dropping calls like crazy. It's not a phone issue, because 3 of the 8 phones are ancient and 2 are BB's. Yesterday, other daughter and i were on our phones seperately, and we BOTH had dropped calls at the same exact time.
That's my story! : )