[KruBruder]

If your bags are old, they could be dry rotted enough to get a leak close to the bottom at the crease where they roll back up. It could be a slow leak during normal use but as they flex out and become exposed when you raise it up they would leak more causing the issue that you describe. This is what happened to mine. Even at normal height, if I parked at an angle that would extend a bag more than normal the dry rotted part would flex and allow it to leak more. I have replaced my bags three times in the last year. When I replaced my OEM bags due to dry rot I went with a cheap set from Ebay(Suncore I think). One blew out when I over extended it during off roading. The other blew out when I hooked a trailer to my H2 and the weight blew out the bag. I bought an "OEM" set($185/pr) from AirBag It .com. One blew out in less than 10 miles and they both broke the top tabs off because the retaining clip wouldn't hold them in place. I bought my last set from the dealer($185@) because they are the best you can find. If they don't say Firestone on them they just won't last. It's a good idea to replace the air lines going from the bags to the compressor also($12@). When you pull the lines out of the existing bags they get scored all the way around them and usually cause a small leak when reinserted into the new bag.
I'm sure you know this but I'll put it in here for anyone else that has air suspension issue and does a search. The compressor won't turn on with any of the doors open except the hatch and the extended height automatically lowers when you reach a certain speed.I think it's 45 for mine.