Zenith El Primero Second Hand Delay

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I’ve noticed that when activating the chronograph, the sweep second occasionally takes a few seconds to start. At other times the hand starts to move as soon as the pusher is pressed. Is this considered typical normal behavior for the El Primero?
 
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Not had that problem on mine but it's only 4 months old. How long have you had yours and when was it last serviced?
 
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Not had that problem on mine but it's only 4 months old. How long have you had yours and when was it last serviced?
Just recently serviced. I also recently acquired it so I’m unsure if it was doing it prior to service.
 
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Just recently serviced. I also recently acquired it so I’m unsure if it was doing it prior to service.
I would have expected it something they would correct it by default if it had been doing it before the service so I would send it back to have it solved.