Have you serviced the PTO clutch assy lately? Generally, there is a bracket (part of the PTO cl assy) that attaches to the frame underside and serves to stabilize that portion of the assy that carries the wiring. If that is loose, then what you see can result.

The other situation is where the idler bearing inside the PTO assy begins to fail and intermittently seizes, again causing similar damage.

BTW, the full model # from the ID plate (look in the cavity under the tilting seat) would be helpful to those of us trying to help...