Some more years ago, in the prep school, I had one of these:
It froze only once; in a very cold Winter in the Ukraine at about -30 degrees Celsius. After warming up it was back to life. Back to the future, and some days ago I updated the software of my watch. Wirelessly!
It's a wonderful watch, I am not complaining. I am not sure if I could remember how to put one leg in front of the other when I run if I didn't have this on my wrist. But since the update it freezes on a daily basis. I'm going to downgrade it. I hope it's doable with no jailbreak or root access to the OS it runs.
Times are changin'.