Possibly a daft idea but please check your watch for magnetism.
Use a compass or if you have an iphone there are several apps thet will test for magnetism.
Dont forget that the natural Earth magnetism is around 50 which is fine.
Do you have an induction hob in your kitchen ?
they are well known for "messing up" a watch movement.
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Regards,
CharlesN
Member of the IWJG.
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