Our coach has HWH automatic air leveling as well as RVA(?) automatic hydraulic leveling. When I get parked and have extended the slides, I restart the engine and press the "air button" twice (on the face plate) to initiate automatic air leveling. After a few minutes, when the automatic leveling function has completed, I turn off the engine and do not press any air buttons (on the face plate) so that the automatic leveling system remains in "sleep mode." If and when an out-of-level condition exists, as evidenced by one or more yellow lights (on the face plate) remaining on steadily for one minute, then the air leveling system is supposed to wake up and re-level the coach automatically.
If your 12v compressor is not working for one reason or another, then the automatic air leveling will not have access to air pressure to wake up and do its job. If you have turned off your automatic air leveling after the initial leveling event, then it will not be in "sleep mode" to know it is still on call to keep the coach level.
I do not know if our respective systems are identical or operate identically. But this is how I do it... which is almost exactly how the manual says to do it... and it works for me.