3.70?
I keep getting notifications to update via PC Garmin Express but 3.70 is all that ever gets pushed. Hopefully there is something at the back end that can get fixed, annoying to keep getting the notification only to stay on the same software version.
So you were getting better battery life with 3.70 ? I can't see any info about a 3.80 update on Garmin's site https://www8.garmin.com/support/download_details.jsp?id=12923 - latest one is v3.70 and it dates back to December 18, 2019