The symptoms you mention do point to a faulty sensor. You really need to have access to an EAS diagnostic tool. This would allow you to see what the sensors are doing. It would also allow you to re-set the system. I have an EAS Kicker from BBS which you are welcome to come over and use if you like.
The continuing settling you refer to is a symptom of one or more sensors not being read properly due to internal wear. What happens is that the voltage readings jump to a different value, so the computer lowers the other corners to match, that sets off an unexpected reading in either the same or another sensor and the cycle is repeated. In extreme cases the car will shuffle itself down to the bump stops!
If the system is working correctly, after you switch off and leave the vehicle, you will hear a few clicks and farts as the car finds its level. But even on uneven ground this should only last a few seconds.
I've mentioned this before somewhere on this forum, but when I was working on my LSE in 2010 in a central Victorian Landrover workshop, they learnt to reset the EAS on P38s as a matter of course during servicing. Sometimes this would be because they noticed the car wasn't sitting as it should or perhaps the customer mentioned that it wasn't riding too well. Often, a simple reset would be all that was needed and the customer was amazed that the car was now riding like new. Apart from genuine errors that needed attention and replacing shocks (every 100,000km from memory) a simple reset every service was good preventative medicine.
2013 D4 expedition equipped
1966 Army workshop trailer
(previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE 3.9V8 then HS2.8)
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