Ok here is the deal. I'll keep it short and sweet for you. I feel like alot of this is software glitches.
First just reset the device off the bat. For whatever reason the provided USB to wall outlet charger may send too much power into it and causes this software bug to be exacerbated.
Now put it on the charger before even setting it up BUT USE ANOTHER OEM USB CABLE and plug it into your COMPUTERS USB SLOT.
This will send a smaller amount of power which wont overload your watch. Leave it there for 1-2 hours depending on what charge it's at now.
Now once it gets to 100% (which unless you have a faulty battery, it will.)
pair it with your phone. In the future until this bug gets sorted out, when it charges make sure you HAVE THE SCREEN OFF WHEN charging. Find that information on another post. If not I'll tell you how.
It should be fine from then on.