Have a sundance spa aruba 2000, was told my circuit board was bad after the temp sensor was replaced. My spa was running on low and would not shut off, high speed alos worked but whne pressing the button again to shut off spa it would go back to low pump mode. After replacing the circuit board and powering back up, the tub was fine for about 5 hours then it started running on low again, there are no error messages, and it is maintaining heat?? any suggestions would be appreciated