Nexus 6p screen turns black after unlocking

I have had my nexus for about 3 weeks now. For the most part, everything was working fine. Now, it is acting very strange. I am able to see my lock screen. I can pull down my notification center from my lock screen, I can turn on the flashlight. Everything that I usually can do from my lock screen, I am able to do, but as soon as I unlock my phone whether from my pin code or fingerprint, the screen goes black. Sometimes it works regularly, but most of the time I have this issue. The screen is not damaged, so I have no idea why its acting like this. Please help