unresponsive navigation keys

I've been having issues with the navigation keys on my Nexus 6P and I'm hoping someone can give me some insight on how to remedy the issue. My 6P worked fine up until a week or so ago, I was running Pure Nexus with Elemental X kernel and all things were good. I decided to try the N Preview so I went back to stock and updated OTA. After a few days of running rooted N Preview I noticed that my soft keys were no longer responsive. I factory reset the device and was happy to see that the < > keys at the bottom of the screen functioned during the set-up process so I figured my issue was resolved. However, when I get to the home screen the navigation keys are again unresponsive. This area of the screen functions in the lock screen as well, but when the bottom transitions into the soft keys it goes unresponsive. I have flashed a number of different rooms, wiped user data, went back to completely stock and consistently the bottom of the screen works in TWRP recovery and during the set up process, but once the OS loads the navigation keys don't work. To be specific, they don't work at the bottom of the screen, when rotated to appear on the sides or top of the screen they work fine. Any ideas?

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