No issues with mine...but I don't keep it on for too long. Will test and report back.
Although, I wouldn't be surprise the car send command to close valve depending on status of the car. For example, (not directly related) if you are low on gas, the car will switch sports mode to comfort mode automatically. So depending on what BMW have decided to do to trigger closing the valve, I can see that is what happening with the open / close valve.
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