I would suspect an air leak near the dump valve or governor connections, or the air dryer. A spray bottle filled with kids bubble soap will detect any air leaks. How long since the air dryer desiccant filter has been changed? If it is depleted this condition can happen too.
Just be sure to block under the frame to prevent being harmed from the MH suddenly losing air spring pressure, BEFORE crawling underneath, and use wheel chocks.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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