Watch runs perfect for days, and suddenly stops.

[Mark]

5 hours ago, fjseal said:

Neverenoughwatches, you advise against winding the ratchet wheel with a screwdriver. Why not?

Look at the size of the screw head compared to the thread size. It doesn't take a lot to sheer off the head from the thread possibly leaving the thread embedded into the barrel arbor. That would be bad.

[Nucejoe]

1 hour ago, apandersP said:

As far as I discovered, it only stops on the wrist. I had it laying on the bench for days without stopping (winded it every morning).

Fully wound I presume ?

 

  End shake adjust in escapement is significant,  if excessive then fork pallets and escape teeth interface change in different positions, thus  small misalignments let pallets face or escape teeth to extremes of free play interval, where escape teeth can't  escape. So when adjusting end shakes, you want fork pallets and escape teeth in one plane with minimum end shakes. 

 

  

 

 

[nevenbekriev]

OP, try the following: When the watch has stopped, open it with extreme care in order to not make it start working. Then observe the balance. Is it rotated from the initial (zero) position and blocked? Such blocking is usually caused by the guard pin pressed to guard roller. Will it be enough to return the balance to zero position for the watch to start working?