Why does the alarm of my Vivomove 3s go off on a different time than shown both in the app and on the watch? It happened twice times last week: alarm was set at 8 AM but went off at 7:20 AM. This morning it was set at 5:30 AM but went off at 6:00 AM. Strange thing is that both 7:20 AM and 6:00 AM are not included as alarm times..