Repeat customer here - I logged a run yesterday with my Forerunner 35 that is corrupted - however the symptoms are different with this one. It actually uploaded successfully to Strava, but there are some data elements that are bonkers:
1) Date of activity - Strava shows as November 17, 2002. It was recorded yesterday 7/3/2022. The activity date shown in Garmin Connect looks correct however. So I'm not completely sure this is a Strava issue reading the file, or if it's issue #2 below that's causing this?
2) The time and pace numbers are way off in the FIT file it appears. When I open it with GPXSee this is the summary data it shows for the activity. Neither of those numbers should be that huge for an 8.4 mile run :)