I got up this morning and went to my watch drawer and pulled out my Bulova Royal Clipper 1954. It was dead even though I wound it the night before. It is self winding so maby it was just sitting too long. Nope it ran for a minute when I set it then tightened the back thinking it was pushing on the crown; nothing. I have been up for an hour it has run for 7 minutes. I have a combination of bad luck and stupidity that is true. The kicker is that it was at the shop a month ago and I only more it 5 times. I did not drop it once. I took the back off and there are no loose parts and the balance wheel just wont stay turning. It runs for long enough that the springs are good. So many of the watches I have worn have broke soon I have owned them it is expected to break but this is maddening. What are the causes for a healthy watch to simply stop working?