I have the same set up and ride in two states. In NJ I rarely use the FD and no problems. In Pa. lots of shifting again no problems. If the unit is communicating a shift, doesn't that mean the electronics, software, transmission "thinks" it shifted so the command was received by the RD? I would guess some mechanical problem??? Can you duplicate the problem with the back wheel off as shifting up requires overcoming more resistance. In any event keep us posted and agree, although I do love the system, at this price point nothing but "perfect" it acceptable.