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I'm guessing it came because it took too long for the compressor to reach sufficient pressure. You cannot have a big leak, then it would be a worn out compressor. But a worn out compressor often comes from a small leak somewhere in the system (valves or air springs). I think you should at least have the suspension checked with Star.
In flat surface during parking it is not sagging but in rough and little bit uproad rear passenger side just sag little. When i open the door it rise maybe it is self lowering. I will attach picture(it is not to much noticable but i can see the differences and how it rises) thanks