I have a 2008 2305 and recently I have found (whether mowing or using any other implement) that the PTO will not shut off. However after 20 minutes of using the tractor the PTO will start working correctly. I have checked and changed the PTO solenoid and the PTO switch and have serviced the machine at normal intervals. Everything else on the machine works correctly, I just can't seem to run down this one gremlin. Any help would be appreciated.