Not sure if that is connected with the latest software release but it happened now for the first time.
At one point, the watch had a huge delay when I was pressing any of the buttons. For example, one press on the light button and around 30 seconds later it vibrated and the backlight came on. Same happened with all other buttons. During that time, the kilometer I ran so far changed. I was at 8.7 km and suddenly it showed 8.2 km and again later 8.7.
It was like my laptop when the virus scanner is on, everything is delayed. It happened at the end of my run and now after a switch off/on it worked normal again.
however, my track on endomodo looks strange. Whereas the total kilometer are correct, the map and the heartbeat monitor only shows a little more than 1 kilometer total distance. http://www.endomondo.com/workouts/291202239/4534418
Not sure if the two problems are connected...