Watch runs perfect for days, and suddenly stops.

[apandersP]

Hello. I’ve got this beautiful Citizen Alarm Date. The watch runs perfect and is really accurate, but it suddenly stops. It can run for days without any issues, but then stops. When it stops, it starts right up again with a small wind. 
 

The hands is not close to each other, and I can’t really find any issues.. 

Does anyone got any advice and suggestions?

The movement is Citizen Cal. 3102

It doesn’t matter how much the watch is winded, it can happen almost fully winded and half winded. 

 

 

 

Edited February 28 by apandersP
Added text

[nickelsilver]

When was it last serviced?

[apandersP]

3 minutes ago, nickelsilver said:

When was it last serviced?

I got it for my dad’s birthday, because it from the same year that he was born. The seller told me it was serviced, my timegrapher reading don’t tell me that it’s need a service. 

[nickelsilver]

What does the timing machine say? In both horizontal positions, and 4 vertical? The fact that it's stopping the watch is saying, "I need a service". Lots of sellers do "servicing" , with the quotes being very important.

[RichardHarris123]

My guess (educated or not) is a rogue particle, lint, swarf etc. It's moving around the movement, occasionally jamming it up, a small wind dislodges it. 

[apandersP]

7 minutes ago, nickelsilver said:

What does the timing machine say? In both horizontal positions, and 4 vertical? The fact that it's stopping the watch is saying, "I need a service". Lots of sellers do "servicing" , with the quotes being very important.

 

[Knebo]

45 minutes ago, nickelsilver said:

4 vertical

This one, too, please ! 

[apandersP]

13 minutes ago, Knebo said:

This one, too, please ! 

 

[Knebo]

3 minutes ago, apandersP said:

 

Still two more missing. 

 But you can already see that something isn't right. 

Even the two horizontal positions are suspicious - the difference in amplitude between dial up and down is too much. 

In the two vertical ones, which amplitude seems ok, the traces are messy. 

I've recently had similar traces when a wheel was out of round (more precisely: not flat) and endshake was way too large on some train wheels. Could be other things. But definitely not in good shape. 

[apandersP]

I’ve got it to run good now. It doesn’t stop anymore. I changed the pallet fork. 
 

But after casing the watch, the alarm won’t work. It worked fine when I made it ring when I should put on the hands. But not after casing the watch..