No, that is not normal. Have a system on our Lexington and keep it at 70 psi. It will loose a few lbs of psi over a period of months, but never more that 5-8 psi. Like a tire, the bags will loose a few psi over time, but not 30-40 in a few weeks.
First and easiest thing to check is to make sure the schrader valves are tight. Those are the little spring loaded valves that are screwed into the valve stem.
You can buy a simple schrader valve tool at just about any auto store. for a buck or two. It's notched on one end and you simply tighten the valve. If loose or not seated all the way, it will leak air.
Also, you can get a little kit that will have some new valves included. Always nice to have a few on hand.
If that dosen't solve the problem, then you have a leak in a line or the bags. Either will need to be replaced as their is no "repair".
Grumpy
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Steve & Cheryl + Zoey, and Ziggy, our furry kids.
2012 Forrest River Lexington 283ts
2013 Subaru Crosstrek toad
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