My Venu 2 has always tracked sleep normally, except for the past few weeks where it suddenly started to record 24+ hour sleep sessions. Garmin Connect would show a single sleep session lasting 50 hours or 80 hours.
I performed a master reset on the watch (both buttons held down, release top button after vibrate, release bottom botton after 2nd vibrate) and started using it again. Now, I have a normal sleep duration and corresponding insights generated on the watch, but they don't sync to Garmin Connect - web or mobile app.
I have:
* Software Version 12.13
* Sleep glance enabled and visible
* All-day pulse ox enabled
* Watch synced via Wi-Fi
* Watch synced via Garmin Connect on Android
* Watch synced via Garmin Express on Windows