problems with Radio / TV 750il

[540 touring]

Hello

I've just bought a 1999 750 il and it is awesome.
However I'm having problems with loss of sound on the TV and radio. Sometimes it works fine, but then suddenly the sound goes off. The picture is fine on the TV, but then again the sound goes off. The sound on the CD is fine all of the time.

Any ideas?

thanks

[shogun]

ask here, they are specialised on E38
http://www.bimmerboard.com/forums/e38/