I have a m6800 kubota tractor that starts fine but when you release the key back to the run position after about a second or two it shuts off but will start right back up until you release it to the run position again.If you hold the key in the start position it will keep running fine for the moment.Is there a simple way to check the stop solenoid first to make sure that is not somewhere in the ignition switch which is clearly more difficult to check first any thoughts would be appreciated.