Dan S
·You should make sure the watch is fully wound. Turn the crown 40 times or so before putting it on.
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I’ve had it on all day after winding it up.
Sorry, that wasn't my point. Did you fully wind it BEFORE putting it on? I presume you are trying to understand why the watch is stopping, so the first thing to determine is whether the watch is fully wound, and the only way you can be certain of that is to wind it manually.