High pitch tone from speakers

Mikeym87

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Hi

Hoping someone can help me with an ongoing problem i have with the Bose sound system on my S3 sportback.

There is an intermittent high pitch tone coming from the speakers (sounds more like rear driverside) isnt too loud but is becoming annoying.

Are there any known faults with the Bose system that could cause this?

Cheers

Mike