Suddenly stopped auto detecting activities?

I've had my cirqa for 3 weeks now. It sotto detects my bike rides fine - never records distance, but that's fine.

Today I rode into work - an hour each way. Heart rate was elevated and it definitely knew I was doing an activity as it told me when I'd reached 60 minutes.

Nothing on garmin connect though - no activity detected.

Has anyone experienced this? Is there a way to get it to log those activities?