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Interesting thread.
I have the same problems with my Sub 126610, purchased in 2021.
In the beginning, it was amazingly accurate, on the spot, a few seconds per month from atomic time.
Then, after 12 months, it started to run slow, and I have the impression, it's getting worse and worse. Sorry I have no equipment to measure the correct values...
Actually, the watch is at about -8 s/d, and although I can live with that, it starts to bother me to adjust the minute hand every 2 weeks...
I have had many Rolexes in the past, and absolutely NONE of these had similar issues.
With some background in physics and mechanical engineering, I can imagine that it is almost impossible to increase the power reserve from 48 hrs to 72 hours within the same volume available. If it was so easy, they had done this long time ago. This means, they had to make severe compromises and design many componants to its extreme. With the lube oils deteoriating over time, this might not have been the best choice...I suppose they have no permanent fix, unfortunately.
Just my 2 cents.
P.S. Unsure what to do with my Sub. Give it to service center? Or sell it? Really don't know.
Tom
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