I've had the forerunner 45 for about 8 months, no problems at all. It updated to 4.20 earlier this week and now it crashes every time I try to start a run. I get as far as the second screen that shows 0:00 with the options menu at the bottom of the screen, then when I press stop/start to begin my run, the watch restarts. I've tried to reload the software, didn't help. And this isn't happening on any of the other functions such as biking, walking, treadmill... those all seem to be normal. Thoughts?