Who has a METAS movement that is losing time?

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@Archer I see that you seem to be the resident expert on this forum. What are your thoughts/insights on my dilemma? I'm very confused about how this all could have happened.
 
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Just bought a Seamaster 300 about one month ago. It does seem quite precise when worn, may gain or loose about 1 spd when resting, depending on position. Never read more than 1 spd or so variations in all. Yesterday it was running almost 1” late, left it 9 up overnight and today it’s spot on.