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That’s really weird. The watchmaker said the mainspring was okay? You should get at least a day of reserve. Maybe you don’t gesticulate rudely at people often enough during the day to have wound it up.
I find myself shaking my wrist intermittently to give an extra wind to whatever I wear, and these cheaper autos (and manuals) have never stopped overnight.
Maybe as you think, it was just wound down.
I’m wearing it in the day. Take it off at night and in the morn it’s stopped so I guess it needs a wind?