I now have the same problem as this, did you ever get a response or an answer to this .... very annoying when it has always and now all of a sudden it does not register a run
Like you i dont want to register manually as whats the point of the watch then ?
It's pretty easy, really. Just start an activity. Recording a Timed Activity (garmin.com)
There is nothing broken. Nonetheless, if you feel this should work differently, you can submit a request to Garmin using the web form - Share Ideas | Garmin