For some strange reason, since about three weeks my watch crashes every Tuesday evening during cardio exercise. Afterwards, when the watch (Vivomove style) is reset, I need to realign the watch hands. Yesterday was the third Tuesday in a row. This does not happen, strangely enough, during exercise or otherwise on any other day. Does this have something to do with the 3.9 firmware update from three weeks ago. It never happened before this update....