I have a 4 hp 240 volt single phase motor in a grain bin that drives an auger. The motor is to run in only one direction Counter clock wise. After about four to five hours of run time the motor will start to run backwards. I replaced the capciator thinking that may be the problem. The motor ran fine for about six hours and then reversed again. What else can I look for, the motor has worked fine for a period of six years untill today?