1861 Speedmaster Stops when Running Chronograph

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Morning,

As the subject reads, when I activate the chronograph on my speedmaster, sometimes around the 4-8 minute mark, all hands stop moving... if I tap the watch, the hands get unstuck and start moving again. Any idea what causes this, and is it time for a service? Watch was purchased in 2018, and maybe been worn 20 times...
 
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Sounds like a service is in order. I had the same issue a couple of years back with my Speedy cal. 861 and to it to my watchmaker. One service and new mainspring later it was working perfectly again
 
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Thanks Togri... I should have taken it in right when I bought the watch... I assumed this issue would go away, but no such luck!
 
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G G007
Thanks Togri... I should have taken it in right when I bought the watch... I assumed this issue would go away, but no such luck!

Well, at least you tried to wait it out, so kudos for the effort. 👍
 
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Thanks Togri... I should have taken it in right when I bought the watch... I assumed this issue would go away, but no such luck!

I did the exact same thing and waited thinking it would go away 😁 It didn’t