I've had a playbar for a year, maybe 2. It worked really well until we had a fire and mantelpiece installed in the fireplace underneath the tv and playbar. I now get a really high pitched sound from it all the time when switched on. Is there anything I can do to fix this? The playbar is at same distance it always was below the tv and about 7 inches from mantelpiece. I've submitted diagnostics on 6895893.
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