Brand New Instinct 2x Solar no solar symbol

Hi, this watch is brand new. I just got it mid day wednesday, used it for my first run yesterday. I took it outside to charge it in the sunlight on the first day, and I could see the lux count tick up step by step, no problems. I installed the software update during the day yesterday. Today (3rd day of ownership) I was outside for a bit today and wanted to know how the solar performs generally, but I had just gone outside and keep seeing this "no solar icon"
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I'm outside for a bare few minutes when this symbol pops up, replacing the "charging wheel" widget. I'm in direct sunlight with no cloud cover or obstructions, clear blue skies. 

When I switch back to the home screen I see the charging widget again, but without the wheel. I'm not sure what this symbol means.

But then again I see the no solar Symbol


Now, this is really confusing. How exactly am I supposed to charge this thing if just being outside for a few minutes makes it stop charging. 

this is the graph after all that time outside... one sliver at 100, the rest of the time it wasn't charging at all.


Software version