High Sierra - sleep causes restart after a while

If the computer goes to sleep for a few minutes, I can come back and wake it up just fine. However, if I leave it for a while (not sure how long exactly, more than 10 mins?) and come back it will have restarted and be sitting on the Clover screen.

I've tried messing with the power options. It doesn't restart if I prevent sleep but let the display turn off. I have also tried Power Nap both on and off.

submitted by /u/Xazen
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