Why is my Nexus 5 randomly shutting down after installing Android Marshmallow

[AC Question]

It only turns on again when plugged into a charge. Also, some of my Lloyd mobile banking app no longer works.

 

[B. Diddy]

Welcome to Android Central! Try wiping the cache partition, which can take 5-10 minutes on a Nexus 5: http://forums.androidcentral.com/nexus-5-rooting-roms-hacks/352008-guide-nexus-5-recovery.html