Hi
This is strange, my Dad's E91 320i has the exact same issue that just started a couple of weeks ago.
It sounds to me like some sort of pump issue but as you say it seems to disappear when it gets hot. I did loads of searching around on the net but everyone says the Auto fluid is sealed but his has a resiviour with a dipstick in it (bit no high and low marks). I would also be really interested if anyone else has these issues.
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