Hi, I have a PC hooked up to my Pioneer AX10Ai through the usb-port (direct connection). The problem is that the soundcard is very unstable. When WinXP recognize it properly all works fine, but it often gets disconnected or just recognized as a "unknown device" (with no sound, of course). Is there anyone with AX5 or AX10 that get the soundcard to work more stable? Could there be a problem with my receiver?