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Hi All, I just recently had my Cartier tank fully serviced as the main spring broke ( was running perfectly before the main spring broke and i dint know when the last service was done so I went ahead and did the full service anyways ). Main spring was replaced. Got the watch back from my watch maker and about 5 hours later it stopped working as it seemed like the main spring broke again. Took it back again, main spring replaced, watch ran for about an hour and stopped again, so I then went back and dropped it to my watch maker, fixed it and advised a screw or what not was not tightened and the spring was not released?. So I got the watch back and it ran for about 6 hours and stopped again. Main spring is still good. The watch was able to wind fully but still does not run. I opened it up myself and I can see the balance wheel does move freely. My question is, what seems to be the issue here? Why does it keep stopping? Ill be taking it back to my watch maker for the 4th time now.... Thank you in advance! 1980s Cartier Tank 925 Argent Manual Wind.