Enabling USB Powershare Prevents Sleep?

Enabled USB powershare last night, found a very hot laptop in the morning. Tested different "on lid closed" settings and the power button's light never went off.

Screen locked though. I've disabled it for now, but anyone have any ideas?

Dell 9360 running 7th gen i7. Running Linux Mint Mate w/ Kernel 4.9.4, Xenial Base.