Quick update, I am working on a fix for the API change. The version 8.0 is intended to disable the failing API for Garmin but it seem to have broken Strava for some users.
I am currently unable to reproduce myself the Strava issue, so first thing I suggest is go to settings and tap on Logout and then login again, it should clear some of the connection cache and it may get it working again, else send me a bug report again saying you have tried to logout and back.
Breaking Strava is unfortunate because the Garmin API change breaks downloading history and I am hoping to leverage Strava to get history…
I’ll continue updating this site as I make progress