Problem with stereo bluetooth.

I have a Motorola Bluetooth car kit that I use to stream my calls through.
http://www.amazon.com/Motorola-MOTO...M552/ref=sr_1_1?ie=UTF8&qid=1245281873&sr=8-1

One of the things I was really excited for in 3.0 was the ability to used stereo bluetooth so I could stream my music from my iPhone to my car speakers wirelessly. After installing 3.0, I took my car for a spin to try out the new feature. It works perfectly when the phone is awake but as soon as the phone goes to sleep, the music cuts out and then random snippets are only heard. Is anyone else having problems with this? It sucks that one of the main reasons I was looking forward to 3.0 isn't even working for me.