Do you have any dash light for the air suspension? If no, it would (ideally) good to check your car's fault codes with INPA, GT1 or any of the software packages that do this.

Have you measured the height (left & right) at the wheel arch and compare the differences on "good days" and "bad days"?

IF you don't have a dash fault light - the most likely issue is a slow, intermittent leak of the air bags. If you know that the air bags are the original build - it's a good time and idea to pro-actively replace them, especially as your symptoms indicate this. A defective height sensor will give you a dash code (I've experienced this).

I recently replaced my rear bags (always do this in pairs), a 2 hour job start to finish (I have jacks, stands, air tools, etc. at home). I can endorse Arnott products.

I would expect that the remote trigger initiates the rear suspension power circuit. Sometimes your RR corner is down and the height sensor tells the compressor to start raising this corner.