Know you are saying problem only occurs with FM6 but I suggest you try each of these in turn
Replace batteries with known good ones
Make sure A button isn't sticking (alcohol or contact cleaner spray might work for this)
Go into FM6 controller options menu and assign another function to the A button then switch it back - know this might be difficult/impossible if you can't use the A button
Try another controller
Edited by user Sunday, August 19, 2018 8:33:45 AM(UTC)
| Reason: Not specified