F85 rear moves after long idle. Feels like suspension ?

[Mandinca]

Weird one....
If I sit parked, with the engine running, for a long time (over ten minutes) I occasionally get this feeling that the car moves. Like somone grabbed the back of the car and gently bounced it up and down once, maybe twice.
I have noticed it a couple of times but can't actually replicate it for the dealer.
They want $200 to diagnose it even though it has an extended warranty.

Does anyone have any idea what this could be.
Should the dealer be checking into this without a fee ?

Thanks

[pachieh]

Rear air spring bags filling back up maybe?

I’d check those and the compressor/lines to the air springs first.

[Mandinca]

Originally Posted by pachieh

Rear air spring bags filling back up maybe?

I’d check those and the compressor/lines to the air springs first.

I thought about that right after I posted.....but surely it can't be that since the suspension doesn't sag even if I leave it for a few days.
I just wondered if it re-calibrates itself....

Said it was a weird one ;-)

[pachieh]

You never know… it may be worth having someone either film or measure with a tape measure when you perceive this happening.