A VERY weird phenom: NH abrupt change in speed issue

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I am regulating 6 watches – all are running on the NH35 movement.

After 12 hours, 3 are running + 1 sec, 3 are slow by about -5.

The weird:
30 minutes ago, 3 of those running at -5 NOW were actually running at -10 then.

So this means, they ALL somehow sped up to the same degree, gained 5 seconds within a span of 30 minutes, if not all at the SAME time.

Or, is my reference clock off?
Nope, I am using 2 quartz, and the computer clock.
All are in sync, and nothing changed in the past 24…

A VERY weird phenom: NH abrupt change in speed issue

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