Dorman reverse actuator not working when hot

[PAvector]

When engine compartment is heat soaked and fan is near on or on, reverse motor won’t move, just beeps. When I reduce the coolant temp like 20 degrees, it will work by driving down the trail a few hundred feet. This happened about 6 times in a one week trip. Anyone have this issue or know what’s going on?

 

[maim]

did you try tapping it? sounds like brushes for motor could be sticking.