Sound drops off when using hdmi outport to connect computer to an AV reciever

Satellite M640,I5 2410 processor, windows 7HP. After about three minutes the sound drops off when connected to the av reciever through the hdmi outport. If I touch the trackpad the computer reconnects for another three minutes and then disconnects. If I touch the the trackpad about every two minutes the computer stays connected indefinetly. This problem does not occur if I use the computer to play an audio CD. Any fix suggestions.

Hi peter,
try to repair your permission by open application folder > utilities > disk utility > repair permission.
It should fixed the unexpectedly quit for several applications.
And try to get latest info from Griffin sites, maybe this one will help too:
http://www.griffintechnology.com/support/article.php?artnum=314
ps: why not try macbook built in microphone?
Good Luck.

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Sound drops off when using hdmi outport to connect computer to an AV reciever

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