Have a weird one going on here. Left flipper is occasionally sticking.

Have checked up/down movement and seems okay compared to both RHS flippers.

Have bent leaf switch a little to check to no avail.

Have run coil diagnostic and works perfectly.

Turned off power when flipper stuck and it dropped back to normal position.

Doesn't seem to be any loose wires to coil.

Could it be coil sleeve? Any other things to fault find that I have missed?

Thanks for any and all suggestions :)