I have my PAM 005 for a little over a month now and it started doing something strange. Every once and a while I wind it fully and after an hour or up to 5 hours later it stops. It stops (the second hand that is) in the same place every time, at about 15 to 20 second mark. I pull out the crown and reset the time then I put the crown back and it starts again without winding. I even tryed to wind it up after this happens and I only need to wind a little so I know it isn't running out of power. What do you think the problem can be?