I don’t know if this will help but I had the same issue with my B&O F7 ABA set and even ended up sending it to GGG who tested the board and sent it back saying nothing was wrong with it. He did suggest a friction issue so I pulled both motors in both units and lightly greased the gears and carefully reassembled and the problem went away. George said that it was most likely that one of the motors was slightly misaligned, maybe your issue could be something that simple as well.
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