I'm reaching out to see if anyone else has seen this problem at the start of the School year. It seems like it's gotten less but I am still having teachers place tickets in saying that their student Chromebooks are shutting down and forcing the students back to the initial login screen on their Chromebooks despite us having Google Admin set to only put the Chromebook to sleep when the lid is closed. With younger grade levels this has added more time attempting to have students sign back in again.
I looked at some of the power logs on Chromebooks having this problem earlier in September and I was noticing that a lot of them were getting updates while the lid was closed and that a reboot was occuring when this happening. So basically I'm just looking to see if anyone else is seeing similar issues where lid close action is set to sleep but that their Chromebooks are actually shutting down. We are seeing this primarily on our Dell 3100 2in1 fleet.