Watch stopping randomly

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I have purchased a 105.012.65 from a London dealer.
It’s the last watch on the right in the photo below. The rest (from my collection) kept identical time all day. The 65 keeps good time except every few days it stops for about 1 hour. As you can see it did it again. Then re-started. Sometimes restarts when I push the chrono button.
The dealer has serviced it twice. But it still does it.
Anybody come across this ? Any ideas on the cause ?

 
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I have purchased a 105.012.65 from a London dealer.
It’s the last watch on the right in the photo below. The rest (from my collection) kept identical time all day. The 65 keeps good time except every few days it stops for about 1 hour. As you can see it did it again. Then re-started. Sometimes restarts when I push the chrono button.
The dealer has serviced it twice. But it still does it.
Anybody come across this ? Any ideas on the cause ?

Do you trust the quality of the service at that dealer? Because I wouldn’t if they haven’t been able to fix it with 2 “services.” Might be time to find a different watchmaker who will take a look. Does it stop at the same time?
 
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When it stops is the minute hand usually right over the hour hand as in this photo, could they be touching?
 
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Don’t think so. It was running (late) in the photo.
I don’t know who does the service. I suggested Simon (Flower ?) in the same building.
 
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I wondered if the hands slip, but no, it jams and then unjams if I shake it or start the chrono. Could it be a tired mainspring ?
 
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I wonder about biting the bullet and sending it to Omega for a service
Don't send to Omega, find an independent Omega certified watchmaker.
 
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Why are they not the best default option ? Interested in why you say that.
They will swap a lot, luminova hands and very likely new dial. It will its character.
 
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Beautiful watches. I agree with others, it's time to find another watchmaker to take a look at it for you.