I have read on this forum that too much grease in the AutoHub can cause them to engage.
Failing that, it might sound insane, but just check that your handbrake is releasing properly. My Q had that very same sound after parking on a slight downhill slope. I got out and searched for a stuck stick or stone. Unable to find anything, I got back in and drove off with no weird sound. It happened a couple of times before I realised it was the handbrake just barely hanging on.
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