Mine is having the same issues. Bought it on July 19, 2017; and I've been getting these same issues.
Very annoying and embarrasing when trying to stream gameplay to friends and viewers, and I feel like a goof hyping this technology up just to have people watch me on Twitch tinkering with a grey screen for hours on end.
I've gotten rid of all reflection, gotten the PCI-E card recommended by Valve support, gone through all the USB/Drivers available, updated all firmware, reseated cables, moved my basestations, and more already.
I also think mine may be a heat issue, as when I cover some of the sensors with my hands it seems to work fine; but this is not a real fix as I need my hands to play!.. My last resort may be to use a piece of paper and tape to cover one of the sensors permanently, but I am worried it may make it worse.