air suspension fault....or not

hi i have searched the forum cant seem to find anyone with the same problem, i went out sat came home dropped off the family went back to the car to go out only 10 mins later, the ns suspension had dropped to the bumpstop, this raised when i started the engine, as i drove down the road all seemed well untill i got to a junction and stopped i felt the rear end lift slightly carried on driving to my destination parked up all seemed well went back to the car 3 hr later all was still ok all pumped up n level and is still ok today bizzare goings on???

Check that your nearside height sensor is still attached top and bottom as they can let go,if all is well there then suspect you may have a dufff airbag,they can go days behaving then suddenly just go down.New bags not that cheap but are easy to fit.

Also sudden changes in temperatures make the air bags do funny things, expanding and contracting with heat/cold etc. pump the suspension all the way up and get a spray bottle with soapy water and cover the bags to check for leaks.