Hi Randy:
My coach does have a headhunter pump but the pump that is having an issue is on a boat. When crew is onboard using sinks, showers, washing machines, etc there is never an issue, but once owners and or guest arrive the pump will cut off on a fault. Simply turning the breaker off then back on again will reset the pump and it will work again for maybe a couple of hour or sometimes for a couple of days before it will fault again. The mystery is what makes it fault when owners and guest are onboard but not during weeks of use while crew is onboard.
Headhunter techs think it's a leak on the suction side that is amplified by the additional load of owner and guest areas being used. Basically going from a couple of users to multiple users.

Chuck