If you think there is something wrong with your M4S remote, you could try resetting it. Here is the instruction: Resetting the remote might fix this issue. Could you do a quick reset for your M4 remote please? You could follow these steps:
1. Turn off the remote and the board.
2. Hold the "FUNCTION" and "POWER" buttons at the same time for a couple seconds until the screen shows parameters of unit and wheel speed.
3.Then the reset is done
