Garmin connect battery drain - frustration!

Hi there.
I have a problem with Garmin Connect draining the battery on my Samsung Galaxy S21. It uses approximately 15% battery during a full day, running only in the background. During days when it does not drain the battery (after my fixes below), it uses less than 1%.
The watch is a Garmin Fenix 6S.
After googling, I found that others had done the following (with result in parenthesis):
  1. Update the maps using Garmin Express on the computer (solved the problem for maybe 2-3 days, but only the first time)
  2. Remove stored data and cache, uninstall and reinstall the app (solved the problem for one full day)
  3. Turn of auto-update firmware (no effect)
  4. Turn on/off always location permission (no effect)
  5. Turn off bluetooth (no effect, and I want those notifications)
  6. Restart the watch (no effect)
I restart my phone automatically every night. 
This is extremely frustrating. Anyone having additional tips?