I've had two rides this past week where in the middle of the ride, the 1040 just hangs. Drops all sensors, doesn't respond to the screen type hang.
I've discovered that if I touch anything on the screen while it's hung, I inadvertently cause something else to happen. For example, when it hung today, I tried to get to the home screen. Nothing happened, however when the device finally came back to life, it has started a structured workout.
It still had a complete record of the ride, it just hang for several minutes.
Thanks
-marc