I have a Cub Cadet Zero turn 50". My PTO clutch stops working after a while. If I let it sit for an hour or so, it begins working again. When I turn 180 degrees, the clutch disables momentarily and then starts after I go forward. Its almost like it disables when either lever is placed in the reverse position. Is this normal? Could it be the clutch is overheating from it disengaging and re-engaging frequently. Thanks in advance for any help.