Following with interest as i'm having the same problem!
I had problems with both battery and alternater around two years ago on my 3.0L Quattro and had them replaced. Lovely little expense!
The drivers door actuator played up in the winter but was ok in the summer. It since started again and so did my battery drain. During lockdown the car isn't getting it's daily use of course so initially i put it down to that. I since heard that if the actautor wasn't working properly (although it locked it just didn't unlock) the CCM wouldn't know that the car is locked and the sytems would not shut down causing battery to drain. I had the pleasure of changing the actuator the weekend. The battery was flat by the time i had done it???????? Anyhow i charged it up but i'm still having the same problems.
I've also parking sensor problems but can't see it being that. I've also recently found the soind proofing near the fuse box in the boot to be soaking wet!
Time for a new motor but i'd love to get to the bottom of this for my own sanity!
