FYI
https://mightygadget.co.uk/garmin-gps-accuracy-issue-caused-by-expired-cpe-...
Now that explains some peculiar tracks yesterday and today!
That's what made me start looking at it too - very odd with a usually accurate watch.
Mine has now updated the CPE to 'current', and no issues with this mornings run.
Mine too:- Odd seems like some switch didn't get flicked over Christmas!