I had exactly the same problem. I took the back off the transmitter, removed the three screws holding the smaller circuit board in place and eased the throttle trigger off its spindle. I was then able to move the throttle spindle/potentiometer fractionally beyond where the trigger was allowing it to move, whilst at the same time operating the throttle atv/trim button. Hey presto, it sorted itself out. Put it all back together and its now fine. I have no knowledge of electronics, but took it steady and it was very straightforward. hth.