Well, I was hoping that someone with more wisdome than I would solve your problem, but I'll give it a shot.
My last motor home would do that, only it would pop at very inappropriate times, like just after we went to sleep, and continue ocationaly through the night and day.
I attributed it to an internally leaking hydraulic cylinder or valve. That shouldn't be a problem except it can be very annoying sometimes. It would likely take weeks to settle enough to notice.
We never delt with it but I can imagine that it would be difficult to locate the actual faulty part. You might have to just start replacing components till you stumble uppon the problem......
__________________
|