6P Random Freezing

My 6P has suddenly started undergoing random crashes/freezes. Screen will lock up, on screen buttons unresponsive, and the clock stops. They only way to undo this is to hold the power button to reboot.

Has only else seen this on their 6P, or other device? Are there any apps I can pull from Google Play that might be able to help me diagnose the issue (i.e. memory leak, bad app, overheating, etc).

Nexus 6P 128gb. 58gb used. Android 7.1.2. Build N2G48B.