I have an unofficial BT3030 and rarely have problems as long as WiFi is off (my play/pause button does not work but I think thats a hardware fault).

I have however had sound dropouts whenever it tried to play a system sound, such as an incoming IM/SMS will just silence the music for the length of the sound file, but not play the sound. A few times it will also then fail to return sound at all until I fiddle around in media player.

I also once had it connect as voice profile instead of stereo, just turned the BT3030 off then on again and it fixed it.

Of course I have had sound drop at other times due to heavy disk IO but that is normal for the N900 in general and happens with the headphones plugged direct too. That is in fact par for the course using a multi-tasking machine on FLASH media, desktop SSDs had similar problems until recently when they upped the cache and improved the controller chips.