Thanks guys. By now I read many posts about symptoms and DIYs of rear self-leveling suspension. Now I'm clear that's the issue.
Like I mentioned earlier, it only happens once in a few weeks, and I can't tell by eyes that my car rear is lowered or having uneven heights between left and right, before I open the door to see it does inflation.
Or my car's air springs only leaks in a very small degree?
I do prefer the preventative fixes, but I doubt the behavior of the car will still be the same after I replace the air springs...
ART-qitec, after you replaced the parts, do you no longer hear that loud compression noise anymore?
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