We purchased a home 12 yrs ago with ISE Batch Feed Pro 17 installed. It has been very reliable. In last 6 months, when we start it with the drain stopper/activator, it doesn't stop wight away. It eventually does but could be minutes or a trip to circuit breaker.... Would really prefer to fix instead of replacing, since it works well otherwise. Suggestions?? Have no manual either !! Tks.