You have a leaking air bag, not a bad sensor. This quote says it for me

"the corner I thought was low is now consistently deflating. But it goes back to the set height like it should"


If the one that is lowering is an original, I'd bet money that is slowly leaking, it will pump up when the car is running but eventually you'll burn the compressor out of spec if its trying to keep a leaking bag inflated to proper ride height.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards