I realized only earlier this week Garmin Connect has not synced for more than 2 weeks. The app tells me it was not connected to my Fenix 5. Proceeded with software updates etc. and as a result I believe the watch' firmware was updated to v.21.00.
Since 1 Dec, on full charge, I have seen its battery usage crept up from 0.34%/h gradually to 1.1%/h today (now). It just died on me 30 mins ago. It's only been about 4.5 days since full charge. Usually, before this update, a full charge lasts 11-13 days (no GPS usage, or activities) at 0.32%/h.
As for the Watch Face (someone here said it may be a relevant factor), I'm using Analog Switch, by 2aCD. Been using this for more than 3 months without battery problems.
Any ideas how to fix this? Another forum user suggest to rollback to v.20?