Mid 2012 MacBook Pro shuts down after inactivity while on charger.

Mid 2012 MacBook Pro shuts down after roughly 4 hours of inactivity while on charger. It never turns off when on battery, only when connected to the power adapter. On startup after the shutdown, it will sometimes take 5+ minutes to boot completely, cycling through the log in screen where I can't move the cursor or type anything, to a black screen, and finally back to the log in screen where I can finally log in.

MacBook Pro (15-inch, Mid 2012)

OS X 10.11.4

2.7 GHz Intel Core i7

16 GB 1600 MHz DDR3

NVIDIA GeForce GT 650M 1024 MB

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