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Timegrapher - weird fluxation


RAG

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Hello!

I had one of my watches (Longines Hydro C.) on the timegrapher, and in dial up position it made a rather weird fluxation. 

Stabilizing at around +003 and holding this rate for 20 seconds or so, suddenly and only for a fraction of time, it jumps down to -13, for then fluxating - just like that - up to +003 again. Then it stays like that for about 20 seconds, for again jumping to -13 and back to +003. And so on and so forth. 

Why is this? Is this normal?

It could be mentioned that this watch has held an accuracy while worn about 1.2 s/d, but after using the snowblower (and sadly forgetting to take off my watch) which shakes and rattles like crazy, the watch has lost one second. I am thus worried that this might have impacted the performance of the watch. 

Is my fears justified, or is such influxtions rather usual? I have no pictures for the moment of this weird reading. I used a witschi watch expert timegrapher. 

Thanks in advance for your thoughts! 

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The watch is only a month or so old from I tool it out of the box, so I have not opened it nor serviced it. But obviously it seems like the speed of the watch has changed. Also due to this weird reading on the timegrapher, something seems wrong. 

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Thank you for your reply! I downloaded the lepsi magnetism app and to my surprise it detected magnetism. I thought such would make the watch runs fast, but maybe it could cause variable results. 

I will try to demagnitize it and do another timegrapher reading and let you know the results! 

Thank again for all your replys. If anyone has other thoughts do not hesitate to share them. 

Thanks again. 

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