height control

Driving today notice my height control “off” light flashing. I have a full Fox suspension and this light has not come in in 80k+ miles of driving. No codes come up on my scanner. Any thoughts on the cause of this?

Currently on the hunt for a 100 series and found one I like, but it seems to be having AHC troubles. I was curious if anyone has ran across this before? Here is what the owner is describing Originally the height control wasn't doing anything, but after leaving the car a few weeks it now goes...