I noticed that one of the contacts for charging the watch has degraded as you can see on the photo below. Does it also happen to your watches? I did clean contacts with isopropyl alcohol to be sure that it’s not a dirt. It’s worth to mention that I’m not using the watch everyday and it was charged rather less than 30 times since February. I received this watch as a replacement in February as the previous one had issues with battery.
Noticed the same on mine, charges flawlessly though 
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