8800 Movement Date not working - any ideas?

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I've had a Seamaster 300m from new, bought only in March this year. At a sports event, after much clapping, I noticed that the date displayed had shifted to between the day's date and the next date. I put it down as a one-off quirk of the watch.

Almost one month later, the date has stopped changing overnight. I will be sending this back under warranty. Any thoughts of what I might be told? Might it be covered by the warranty, or will I be told that I've abused the watch? I've always been quite careful about hand position when changing the date, so I can't imagine that its something obviously wrong that I've done.

Has anyone else had this? I imagine its not terribly uncommon, however I haven't found any reports of it online.

Also, I'm really reluctant to send the watch in right now, as my other main watch is in for service too, and I can't bear the thought of not having one of them to wear. Am I likely to damage the watch by waiting a few weeks before sending it in? Its still keeping incredibly good time (approx -0.4s per day).

Many thanks in advance for any replies.
 
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I’m sure this will be covered by warranty — even robust clapping shouldn’t affect the date wheel! Things like this can (and do) happen in the manufacturing that is not evident to begin with but is a fault from the start. That’s why there is a warranty.
 
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Sounds like it would be something easily covered under warranty. Ship it!
 
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Have you tried pulling out the crown and completing a full cycle of the dates? If you've changed the date before did you ever do that between 9pm to 3am?
 
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Have you tried pulling out the crown and completing a full cycle of the dates? If you've changed the date before did you ever do that between 9pm to 3am?
Yes - I can do a full cycle of the dates when the crown is in the quick set position. I’ve done it only when the watch is reading approx 6 o’clock.
When the crown is in the time changing position, the date tries to change at midnight, but skips and fails.
 
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Your best bet is sending it in for service asap. This is not a common problem.