Unless this happens frequently I would not worry about it personally. You have warranty on the watch so just use it as you would normally and if the problem comes back, take back it and get it looked at.
With any horizontally coupled chronograph, in my view the most potential for wear happens when the start button is pushed to engage the chronograph function, and the already turning teeth of the oscillating pinion or coupling clutch meet the stationary teeth of the chronograph runner. So in my view, starting/stopping/resetting it frequently is harder on the watch than say letting it run all the time, or obviously not using the chronograph at all.
However this watch is based on the ETA 7750, and that is a movement well known to be sturdy and reliable, so I don't think this is something you need to avoid using or anything like that.
If you want a chronograph that would be able to take all the stopping/starting/resetting/continuously running you want to throw at it, get a vertically coupled chronograph. Examples include the first one (Seiko 6138/6139 - they don't get near enough horological credit for this IMO), Omega 3303 and family, F. Piguet 1185, Omega 9300, etc.
Collectors tend to go gaga over a column wheel switched chronograph compared to a cam switched chronograph - to me personally this is like focusing on the tires that are on a car you are looking at and ignoring the engine...but that's just me.
Hope this helps.
Cheers, Al
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