Unit ID 3348498652 // Software Version 16.50 (d18bc08)
Almost every time I finish a Run or Surf activity, the watch crashes immediately after selecting "Save". Usually the activity is still available to save after the device has rebooted... but not always! I've noticed other instances of the watch crashing under other less repeatable circumstances. Once it crashed in the middle of the night, which was problematic because I rely on the watch's alarm function to wake up in the morning. (Well, I used to rely on that... not anymore!)