annoying sound when playing usb

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This year’s Megane Grandtour with RLINK 2

Since last week suddenly when I put the audio source on usb I always hear a beep during music.
It is constantly a tuut tuut tuut that you hear through the music.
(so precisely a dimmed version of the sound from the sensors)
Is on both usb ports and with different usb sticks.
Any idea what it could be?

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