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CA is a common culprit to cause the "Increased Battery Discharge While Stopped" message. For me, it would occur when the car sat idle for ~2 days AND there was significant rain (handle was shorting out on the circuit board solder points).
And yes, my car would do crazy stuff like unlock itself while I was walking away in a crowded parking lot.
A good scan tool will give you the error codes to tell you where the circuit problem is.
I used Bimmerlink and it dialed me in to passenger rear door circuit faults.
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