Yes, and Sweetwater Tech support seem to be struggling with what to do. I have asked them, if they want to send a third unit, to test it before they do. I suspect that most people do not connect their keyboard to the RCA connectors, and the problem may be more prevalent than Bose understand.
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Graham, Korg Pa1000, Korg G1 Air, Countryman E6, Roland BA330, 2 x Roland CM-30, , Mackie SRM150