I have a refurbished 1985 Sundance Maxxus with a Sentry 800 controler. It has been refurbed from the pumps to the control panel and ozonator. My brother in law had no problems with it for a year and ever since I have had it the GFI tripps intermitetly. I have a 60GFI breaker so I can run both pumps the ozonator and the heater at the same time. It will happen twice a day or twice a month. I have installed an additional ground to the hot tub itself to see if that would fix it but no such luck. Is there a simple solution? or atleast a logical reason?