Agree with PeterH, but the dance problem is almost certainly being caused by one or more wheel height sensors sending false or out of range signals to the ECU. So the ECU continually adjusts the other sensors down and if the same fault is triggered in another height sensor the cycle can continue all the way to the bump stops. Air being extracted from an air bag is passed through the dryer (to purge it) and then through the valve block to the atmosphere. I suspect your valve block is an innocent player in this and only doing its job.
You could also have a hole or tear in one air bag that is only exposed at a certain height.
If your height sensors are original fit, it would pay to replace all of them. Not cheap, but I've seen their replacement transform a P38. And the new ones will last another 20 years.
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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