BMW 5 Series Touring F11 - Air suspension issue - GN-F11-Touring

My suspension intermittently drops on the driver's side rear air suspension when parked. It is fine when driving and there are no error codes on the diagnostics. A leak seems unlikely as half the time it stays level. Any suggestions would be appreciated as it is under warrantee but the garage can't find a fault.

BMW 5 Series Touring F11 - Air suspension issue - RobJP

Take photographs of it when dropped.

Then, book it in, and deliver the car to the garage, show them the photographs, and explain that them not being able to find a fault is unacceptable.

If it's still under the original BMW warranty, then you might want to escalate to BMW GB.

BMW 5 Series Touring F11 - Air suspension issue - GN-F11-Touring
Thanks for the reply. They are willing to fix the car but can't find the problem. If it can't be fixed I will return it to the garage.