There's definitely an issue with the thermostats. My '13 sDrive28i threw a P0597 code a few weeks ago, so I took it in to the dealer and they replaced it. The woman at the SA desk next to me also had a broken thermostat that was getting replaced.
(FWIW, the code popped up at about 61k miles, and was covered under my 6yr/100k mi Extended Service Contract for a $50 deductible. It's a $500 repair if out of warranty.)
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