Things started going weird on October 1. Strava and Garmin stopped syncing.
I called up customer support and they told me that they are having system issues and to try back in a few days.
I called them again on Oct 6 to let them know nothing is syncing. They told me re-install the app and remove all devices and re-connect. Re-installing the app didn't make any sense - since the syncing is between servers - but I did it anyway.
I removed and re-connected to Strava and that's working as of yesterday.
I removed and re-connected to Garmin and it's still not working. Status is saying "Last synced on Oct 1". So I just lost out on 8 days on activities. ugh.
Any idea on what's going on?