Lippert hydraulic slideouts creeping during travel

On my Wildcat the bedroom slide would creep out, I found solenoid valve top had worked loose, don't know if that is the proper term, mine was located in the lines from the pump, the top is black plastic and I tighten them, clockwise, by hand. Every once in a while it will creep out again while in storage, I run it in all the way then tighten up the valve. When it first happened I emailed Lippert and this is what the tech told me to do.

Bill