I just bought a used softub and it was working fine for about 2 weeks. All of a sudden the pump shut off on its own, however the power lights stay on on both the contro panel and the gfci plug. I can get to come on by continuing to push on the reset button and usually after several attempts the pump will come back on..... It will continue to run for about 5 minutes and then it will shut back off... I have it ran to its own breaker... Anyone know what might be causing this?