(These were pre-Ultra watches.)👀
What band(s) were you using? And aren't the Ultra bands designed to prevent accidents like this?
The first one was a metal mesh band with a magnetic clasp. It was very comfortable but if you knocked the clasp it would unbuckle pretty easily, which is what happened the first time. The second time I got a different one with a stronger magnet -- not even sure what happened because when I got back to shore it was gone!