After updating both Instinct and Instinct Solar to 16.50, both watches regularly restart after two procedures:
1. Pool Swimming: Deleting the last activity immediately after saving it forces the watch to restart. This occurs every time on both my watches.
2. Calendar Widget: After deleting an event (all day, already accomplished at 6 am) on phone, opening Widget on watch showing for an instant still the deleted all day event and waiting for updating forces both of my watches to restart as soon as the watch understands the event was deleted.
Both of these restarts are ennoying, easy reproduceable and should therefore be easy to analyze and fix. Thank you!