I've also been having the same issue. I'm in Montreal and we've been having -30C weather all winter long. The clunking sound is coming from my rear suspension and only happens in the cold. Took it to the dealer a few times and they replaced my right shock absorber. Hasn't fixed the problem. It's tough to pinpoint where the issue is coming from exactly but apparently it's been a common issue on the F series BMWs. My friend's brand new 435 x-drive has the same issue!
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