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From your post, I guess you are talking about either Seamaster chronograph or America's cup chronograph. I think the retailer is kind of mis-guiding you. The problem you just described is definitely related to winding and activity pattern. The normal problem related to chronograph is the "stop watch" function not the "time keeping" module.
My suggestion:
(1) Give it a full wind, and let it run down. See how long it lasts. Normally at least 40 hours. This will make sure the main spring works properly.
(2) If the main spring can store enough energy, try to shake it. The Seamaster Chronograph comes with Valjoux 7750 movement, and the roter can only wind in the clock-wise direction (from the back). If you shake it to give the roter at least 500 turns, the main spring should be fully wound. Let it run down and take the time it lasts. This will tell if the roter can transfer energy to the main spring.
If your watch can pass (1) and (2), you still have the same problem, then somehow your activity pattern cannot get the watch fully wound.
As far as I know, Omega 1164 (Valjoux 7750) is a time test movement. Other than your activity pattern, I cannot see what could possible go wrong.
If your watch is America's Cup chronograph, you can also try (1) and (2). However, the roter is really sensitive and can wind in both directions. I work in an office, and driving (very little movement), and it won't stop on me. You should ask the seller to give you another one or request Omega service.
Good luck, J.
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