GFI and Apex help needed

[WarDog]

Originally Posted by reefwithareefer

Positive. I installed them myself.

No parrallel wires, but I doubt that matters, all wires go to a breaker box, which forces them to be in a cluster, does it not.

Installed on a run 20ft long 12/2 wire for each GFI. Nothing special for that

If there is a disturbance on a 20a, will it not be there on a 15a as well.

Hmmm, ok, just asking to be sure.
At this point you may want to get in touch with Neptune, just to rule out the possibility of a faulty EB8. Perhaps check out the Neptune forum as well.
Obviously some funny business is going on either with your Apex, your wiring job (which sounds ok) or any other hardware plugged into the GFI.
AC Electrical problems always cuffuddled me, that's why I chose pipefitting.