iPhone 6 Plus Screen Goes Black

Ever since I upgraded to ios9.0.2 my screen goes black for no reason. Sometimes it will come back on after a reset and other times it won't reset. The screen also goes a blurry grey and the icons are visible but the touch screen does not work and the other buttons are unresponsive. Is there a way to downgrade to ios9.0.1. I was not having any issues with the previous versions of ios9. My phone is unpredictable, once in awhile it will come on very easily after it has gone to the grey screen and other times it takes an hour or two. Some days it can be fine for hours at a time and alot of days it is a constant issue. Is there a fix? Please!

Thanks,

Mark