Audio cuts down every 1-2 minutes RADIO+CD

Hi guys,
recently I noticed that the audio of my E65 cuts off every 1-2 minutes.
At first I thought it was a problem of the CD disc, but later I noticed the same problem when listening the radio.
When the sound cuts off it creaks and 3 seconds later it came buth with lower volume.

What can I do? I though about check the battery or fuses.

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Audio cuts down every 1-2 minutes RADIO+CD