Dougthug,
In the note I sent with my F500BT to Pioneer to get tech supp to look at it, I told them that I tried 4 different phones:
1. A AT&T Nokia flip (generic)
2. HTC TP with the many diff ROM's
3. An older PPC 6600 with Win Mobile 2003
4. Co-workers Sprint Instinct
All made the unit reboot. As much as I wanted to blame the phone, the others made me not launch mine into orbit. If the reg hacks and zip files doesn't work, I will upgrade the phone.