I have been having issues with my Garmin Edge 800, I am having troubles with syncing. Strava and Ride with GPS had no issues. Garmin Connect does. (I just watched the hour glass for 10 minutes) When I look at my activity history on the unit itself, it has all zeros for today's ride. (After my ride it had something.) But before I click on the activity it has my mileage that i went.
A couple of weeks ago, I was on 2 different rides and I looked down and say that my MPH was zero and I was moving at the time. I went home and did a hard reset and everything appeared to be ok
not sure if they are related or not.