When I was looking through some settings in the navigation app, I did not "start" the activity, I just clicked the "navigation" app then went to settings. Then I went back to the normal watch face. I noticed that the buttons would all freeze but the watch would continue to show the time and the second hand would move. I held down the backlight and restarted the watch, then did the same thing again (looked in the navigation settings), but I flicked through the widgets, then the watch froze with the backlight on.
