so now I can tell that this was also the issue in my case. Tanks for your information, I ordered new height control valve on ebay from Japan for 1/5th of our local price plus all 4 globes, and after replacing valve (plus 6 hydraulic pipes outgoing from it) my suspension works like brand new ...
Hey ! I have same issue,
did you manage to solve it?
I alredy purchased items for it, but due to lack of time , haven't done it yet. is everything working well already? i cant find any service willing to do that repair, so i will probably do it myself, but im quite affraid of possible problems...