We installed a new Pentair EZTouch subpanel with an Intelliflo 2 vst pump and two Whisperflow pumps for the spa jets and waterfall. I put each pump on a separate GFCI. The first few weeks, everything was fine without issue. Being that this is a subpanel, I wanted to follow code and drove two 8ft grounding rods into the ground, connected to the ground bus. Ever since then, every few days my GFCIs trip. It's usually the filter pump (inelliflo) that trips, but someones all three trip. I can't isolate this to anything specific. It has not rained and the pool pad is far away from the water and/or any sprinklers.
What would cause a GFCI to trip on a new build? Does it make any sense that all three would trip? I don't see how as the load side is different for each. Is it possible the issue is with the feeder wires -- I didn't think GFCI's check/trip from the line side? The feeder wires are new, but the underground conduit was reused. Also, strange this is an intermittent issue. It does not occur while the pump is running, but typically overnight I get an email from ScreenLogic that it lost communication to the pump (this is how I know to go outside to check the breakers).
Any guidance/thoughts are greatly appreciated!