One possible problem could be that a ride height control valve connection rod has broken loose or the valve is sticking open causing the loss of air sufficient to est off the low pressure warning. Get the coach into any good truck or RV shop for diagnosis and get this issue repaired. Hopefully it is a simple rod kit install. Also find out if the unit has an air filter/drier and have it serviced if you have not done so within the last two years. Good luck and keep us posted.
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