I believe I bumped it one too many times and created a way for moisture to enter, but the first visible sign was that I had left it on the toilet to shower and it was a steamy shower so when I came out it had moisture inside the glass.

The moisture was stuck there for a day or two, came and went depending on temperature and outside climate. After about a week it became even worse and eventually it gave up and showed 0 charge.

I live in northern europe so too much sunlight would not affect it. I was so hyped for this watch that I actually had an american friend ship it to me before it was released here.