Have you recently bled air tanks? Does your coach have an air filter/drier? Have you had it changed out in the last two years? You should. You could have water contamination that might cause this kind of problem but it could also be other issues like gage or sensors.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7