My IPhone 3GS and Bose Sound Dock suddenly drops sound level and then returns to normal. Wifi is Apple Air Port Express. I always turn off the Bluetooth in my iPad and no other Bluetooth devices are on. It drops sound at random times, just very briefly about 3 times an hour. But it is annoying. Both Apple phone support and Bose tell me they have the latest Bluetooth running on respective devices. Could someone please help?