I picked up an MBII from the American Diamond Exchange this past summer in Skagway, Alaska while on a cruise. I love the watch and it is by far the most expensive timepiece that I own. However, it just stops from time to time despite wearing it everyday. I take it off at night while I sleep. I will be wearing it and notice that the time is way off and that it has stopped. I end up pulling the crown, resetting the time and then it starts working again with a shake. This watch is supposed to have a 38 hour power reserve. The frequency of this is every couple of weeks. Is this indicative of a real problem?