I do have a surge protector, and I recently replaced the original 300 watt P.S. with a new same wattage P.S. I replace cables every 6 months as a matter of maintainence, and the lights only flicker during our 2 or 3 times a year rainstorms(no lie!!) which is what makes this so screamingly frustrating. Also, the system is only run 10-12 hours a day

I do wish to know the cause, but that might not be a bad idea Elmore. Thanks to all who help. It has become one of those things where the desire for the solution is based more on pride than good sense. I will not be defeated by a mere machine.......