Mike...assuming install/programming is perfect...I've seen this before in a coach we did where one remote would open up the RF from a button press and during that extremely brief moment a button press on another remote would get through. Almost as if during this brief moment the ID is ZERO. This was with 2 remotes and 2 RF kits...not that crazy setup the OP has which obviously leaves alot of room for installer error. I for the life of me can't remember how it was resolved and haven't run into it since, I'll talk with the installer who contacted URC.