A few years ago, we had the pump suddenly start cycling on its on in the middle of a 3 week trip. I tracked it down to the shore water inlet check valve letting water out. At least all of the leaked water was OUTSIDE of the RV. I bought a garden hose shut off valve and screwed it to the shore water inlet and closed the valve. That solved the problem until I could get home. When at home, I replaced the check valve.
Bobbo and Lin
2017 F-150 XLT 4x4 SuperCab w/Max Tow Package 3.5l EcoBoost V6
2017 Airstream Flying Cloud 23FB