Can't hear phone when away from car-mounted Bluetooth unless....

[TheBundo]

..... unless I manually turn off Bluetooth on the Mogul, or turn off my visor-mounted Supertooth BlueAnt 3. If I walk away, even 100 ft., and a call comes in, it's silent in the speaker, and no way to get it back until I re-boot. However, it re-connects to the BlueAnt when I get back in the car. So to have a working phone when I leave the car, I MUST disconnect it while they are still in range, or shut the Supertooth off before leaving the car.

Anyone else have a similar problem with any bluetooth device?