My WAY211A did the same in very similar conditions, I wore it for at least for 10 hours day before, it was actually in China and I almost missed my arrangements for that day, fortunately I checked my phone
Accuracy of my WAY211A is now "all over the place" as well, it makes -20s a day, then it makes -6s and so on... for first couple of months accuracy was normal... TAG is really spearing costs on movements, someone has to pay Alec Monopoly, so they use low grade of movements, which is why this happens.
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