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This help is coming out of left field but it worked for me eventually.
I don't have comfort access but did have remote control access and starting problems as you describe.
I ran through any number of batteries until.....
I watched an online video where the guy described the same issue in a 3 series. He replaced the 12v battery and cured the problems.
I was incredulous that a 6 yr old well maintained oem battery could fail. No starting issues or any other voltage related matters. But out of options thought id try it and it solved the problem instantly.
As others have noted the electronics seem to be very susceptible to low voltages.
Search my posts for the write up.
Hope this works for you.
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