I just had the exact same issue in my 2009 50i this past weekend. Parked it with valet, and got it back two hours later with no time and date. The trip odometer had been reset, too, but everything else worked fine -- nav & radio presets, seat presets, etc. I blamed it on the cold weather but haven't driven it again to see if the problem has resurfaced.
As another issue, I have the 20-way comfort seats and have noticed that the seat heaters in the front thigh bolster (the one that moves up and back from the seat) only rarely activate. Does anyone else have that problem? I've tried tinkering with Seat Heater Distribution in iDrive to no avail.
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