The drain valve in the foot of the mattress has a silicone ring in it, any particle of dust or dirt will cause it not to seal well and it will leak down. Go online and find the mattress instructions (if you don't have them in your owner's packet) and there are instructions on how to remove and clean the valve. We had the same problem and once we cleaned it, it's held air for 3 or 4 days at a time without leaking down.
Hope this helps.
John
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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