"I've been using W10 since its release without this issue. I can't recall exactly when this problem started happening but it has been like 4 weeks ago."
So, I have found the solution, at least for me.
Ok, I understand this post is almost a year old. However, I think that your "4 weeks ago" was exactly the date when you put on a metallic/magnetic bracelet on your left hand.
I had the same problem, and when searching for information about "ASUS laptop going randomly to sleep", this post comes high in the search.
It was my metallic BRACELT WITH A MAGNET that I wear on the left hand, that touches the area left of the mousepad (left corner of laptop). There seems to be something reacting to the magnet/bracelet, and the laptop thinks the lid/screen is closed, and it goes into sleep mode!
I have tested this several times now, and yes, this really was the problem for me. Feel a little dumb after searching the net for answers and updating all drivers etc, but anyway, now the computer works again :cool: