Comment by GeekyBear

The Nexus 6P had the same issue with random shutdowns, and although Google refused to do anything about it some users on XDA developed a patch that disabled all the performance cores completely.

> XDA user XCnathan32, along with assistance from two other users, created the fix and put it up for anyone to give it a whirl. Without getting too technical, the fix shuts down all four of the Nexus 6P octa-core Snapdragon 810 processor’s performance cores that seemingly prevent the phone from properly booting

https://www.androidauthority.com/nexus-6p-bootloop-fix-78930...