Computer shuts down every time I close the lid

I have a Precision 5510 that is about 2 months old with Windows 10 installed on it.  Over the last 2-3 weeks it has started shutting down _every_ time I close the lid.  Granted, I never close the lid and open it back up right away, it is usually hours later or the next day.

My settings specify that when I close the lid it goes to sleep on both battery and plugged in, but now it is apparently shutting down because when I re-open the lid later it is booting up.

I have seen another post that mentions trying several things like updating video drivers or doing diagnostics on the hard drive.  What should I check first?