I own a dynesty spa with a 220V motor. The problem I am experience is the spa will start either on timer or manually. After running for approx10 min to 1 hr the GFI will kick off. It seems to happen when the contactor kicks in to adjust temp. I here the contactor kick on and off in short intervals ant then the breaker goes off. It can also happen when I adjust the temp by turning the temp knob. Could the Thermostat be bad or something else. be shorting out the system? Any suggestions on where to start would help.