Watch stopping/slowing

[omeega]

I recently purchased an SMP ETA and it seems to keep perfect time for a day or two, then I will look down and it's 30 minutes to an hour and a half slow like it stopped when I wasn't looking. I do wear it running sometimes, I'm wondering if that could mess up the movement. But yesterday it slowed down at work just wearing it normally. Any ideas?

[14060 or 16610?]

I recently purchased an SMP ETA and it seems to keep perfect time for a day or two, then I will look down and it's 30 minutes to an hour and a half slow like it stopped when I wasn't looking. I do wear it running sometimes, I'm wondering if that could mess up the movement. But yesterday it slowed down at work just wearing it normally. Any ideas?

Watch the seconds hand as it rotates around the dial to make sure it doesn't rub on the minute hand. Take a loupe and look to make sure the seconds hand isn't pressed too far down so that its post is rubbing the minute wheel. Then put the watch in time-setting mode and slowly rotate the minute hand around to ensure it clears all the markers. If this all checks out OK, you may likely just have a dirty movement which needs service. Or possibly your mainspring needs to be checked out.

[HauteHippie]

I had this happen once. For me, it was one of the movement clamp (or whatever they're called) screws not being tightened down all the way so that the rotor would intermittently get caught on it. I tightened down that one screw and was good to go from there on out.