[kupo]

Wow I didn't realize so many people used it for the same purpose, I hook mine up to the car stereo as I drive and listen to my music collection. I guess I should elaborate my setup a little more so everyone could learn from it. I run a linux box at home, which is running a streamserver called edna (http://edna.sourceforge.net/)
It will roll through your music folders and generate m3u's on the fly. I set this as my home page in my browser. I guess I'll give one of your alternative players a shot and see if that cures it, easiest way to troubleshoot methinks.
No one else has had to tweak their reg to get the phone to continue streaming audio while in hibernate mode?