L322 air suspension

When I bought the car a year ago the seller made me aware of a fault but supplied a reader and I just used to clear the fault every few weeks but now it clears then practically straight away reappears.comes up as reservoir looses pressure when filling.Anyone had this and rectified it before I start chucking money at other potential faults ?

I had 'pressure static whilst filling' for a whole, the fault progressively got worse (started occurring once every other week, then months later was every other day)
A new Compressor unit sorted mine, nearly a year on and fault not come back (touch wood!)
But several things can cause the fault. Are there any air leaks? Any idea how old compressor is?

Further to my last....this is worth a read;

https://www.landyzone.co.uk/land-ro...ng-pressure-drops-when-filling-do-not.207207/

But like I said, my issue turned out to be the compressor......

What 'reader' are you using? Does it enable you to see the live pressure in the reservoir?