Went on a bike ride today, and manually started the activity tracking before I set off. Watch indicated a GPS lock - vibrated, screen changed, allowed me to start the activity. While I was riding it was showing my current speed on the watch display. But the distance stayed at 0.00, and the average speed also stayed at zero. Bike ride was about 10 miles, and it continued like this for the entire ride, but all the while kept displaying a realistic and continuously updating live speed. So the GPS must have been locked and working for the watch to calculate the speed. I can only think it's a bug that prevented it from recording any distance or route data during the ride.
I assumed it was an issue with the activity display screen, rather than the actual logging (as it's also really slow to update my lengths on the display whilst swimming, just thought this would be a similar lag). After the ride I found no distance/gps related data in the Connect records of the activity - it was las if I'd done the whole ride without GPS enabled. I then recorded several other test activities (cycling and outdoor walk) to see if it was a one off, but every time it did the same thing - no trace of any GPS recording despite every time saying it had acquired GPS lock before commencing the activity. In the end I rebooted my Venu 2 and after that the GPS recording started working again. Now, that's the first time my watch has rebooted/powered off in weeks (if not months), but it still shouldn't forget to use GPS during activities?
It's running software v9.7, GPS version 6.01, and GPS is set to GPS + Glonass in both cycling and walk activity settings.