Mmm it’s back!!
I have enough oil to drain and change again so it’s clearly a diff problem.

Mine is very occasionally doing it now to, so I’m going to do another oil change.

Was experiencing the issue with mine. After researching fluids, I decided to use Royal Purple Synchromax in the transfer case and ACDelco 10-4032 (GM 92184900) gear oil in the e-locking rear differential. After changing the fluids twice, driving 50 miles between changes, it's been as good as new for several weeks now.

I will give it a go, we are down in Cornwall on a road trip and it’s fully back bumping all the time now, better when hot.
Could it be the solenoid?

Just to throw a curve ball into the mix , changed all 4 tyres last week & alignment done and have had a noticeable improvement . Was running Conti Sport contact LX SPORT . Fitted Conti Sport Contact 7s . One of the rears had heavy feathering on the inside , actually failed the MOT . Had the tracking done too which might have made a difference too but camber cannot be adjusted on rear so unsure of what can be done as it’s a ball hair within tolerance .

Booking into Mikey in a few weeks so will monitor and report back . 2019 SV AB Dynamic Scafel Grey

My 4 wheel alignment needs doing, asked main dealer and a reasonable £125 inc vat.
Mine with an oil change went for 100 miles buts it’s back.