Help with bluetooth

[crwmlw#IM]

Hi everybody. Hopefully someone can help. I originally purchased the Motorola T215 Bluetooth visor mount for my Verizon iPhone 4 and it would pair initially but then wouldn't pair again when I got within range, I would have to power off the bluetooth then back on again. So then I decided to try the Motorola T325 and the same thing happened, it would pair at first but when I leave the car and come back to it, it doesn't re-sync. Anyone else have this problem, or recommend a visor mount you are using that works well with the iPhone 4? Thanks a lot, Chuck