Screen often dimming, sometimes completely black

I am currently having two issues with the display on my new Forerunner 965

1. Intermittently, my display will dim so much it is unusable outdoors. I can see the screen indoors and when I go to the display brightness settings it does adjust the brightness but the brightest setting is still too dark to be readable outdoors. The only thing I have found to return the display to normal brightness is to power off and on the watch.
   1. the watch can go for a few days between this happening and there is no pattern that I have noticed
   2. it doesn't recover by itself after waiting for > 2 days
2. Less frequently my watch screen will be completely black. the only way I have found to resolve this is to press and hold the power button for > 30 seconds, wait a while and then power the watch back on.
   1. the watch doesn't automatically cure itself, it was left for over 24hrs once and it remained in the faulty state
   2. there doesn't seem to be any pattern to when this happens, However it has not yet happened during an activity. 

I am currently trying to upload videos and pictures for support to check this out, pretty miffed that I bought this watch for an event later this month and it is highly likely I will not be able to trust the device to be able to use it.

Anyone else having these issues? found. way to cure? some rogue setting hopefully?