Adaptive suspension fault Jaguar

Last March I got a Jaguar XJ Portfolio and it seems to have a pastime of throwing up warning lights to annoy me.

Originally it was tyre pressure light randomly coming on for a while and then disappearing, garage checked it and said everything is fine. Stopped it's shenanigans in April with no help from garage.

Next was DPF light, went to garage they cleared it but didn't fix anything, light came back and fixed itself after three days and I've never seen it again.

Now with none of them lights present anymore, I'm getting suspension fault and adaptive dynamics fault. Straight back to Jag and surprise surprise they can't diagnose it either. The warning comes and goes and while present you can't change suspension mode.
Recently it decides to lift itself up on the back passenger side if you open either passenger side door before the drivers door. Body would be 10 cm higher than tyre on passenger side and 2 cm the other side. I learned by starting the car three times it will level out. This is a problem I've seen on the internet and seems to normally be a height sensor problem but the garage says it's not.

I brought it to a normal garage and they said they can't get the reading for suspension faults and to go back to Jaguar.

I didn't buy it off this Jaguar dealership but it's still under warranty. They seem like they don't want to fix it.

Anyone have any similar problems with a car not storing problems or dealership unable to read them.

The suspension warnings can last anywhere from 1 min to 2 days. No warning lights are present when it decides to lift itself up on the passenger side.

Garage and even the handbook say it's safe to drive with the adaptive dynamics fault present.

I don't want to sell it as I only had my last car five months before trading.