I thought it best to send mine back to confirm if its a bug or if its a defective unit and if its the latter and others with the same issue are from a batch made when mine was then we know that at least they can be returned and fixed or given a replacement. That way we know where we stand either way.
Was it because of the inability to skip backwards though? I'm not sure if you saw my post earlier, but it appears it is just a case of them changing the way the device worked in firmware 1.37 but forgetting to mention it. Skip backwards is now two quick taps on the button.
So not a bug or a hardware defect, but an unexplained new feature