One of the biggest upgrades to Daydream View's 2017 model was the inclusion of the newer, Fresnel Lenses. These lenses are designed to be thinner, or flatter, but still, give the full range of optics when using them in VR. Both Oculus Rift, and Vive already use these lenses so it makes sense that Google would join in as well. But with great Lenses, comes great responsibility, or in this case, great glare.
The glare is caused by the manufacturing technique of Fresnel Lenses that create circular grooves in the glass. If the light from your phone shines just right it causes a circular light in your eye. It is frustrating but there are some tips to help.