Windows 8/8.1/10 Computer goes to sleep while playing MS

Maybe you're accidentally pressing an Fn button that makes your computer go to sleep? If you have those keys (usually on laptops only I believe), do you have one that has a moon or the letter 'Z' on it?

 

When it happens, have you noticed that it happens after you press certain keys, like jumping or using facial expressions? Or does it seem to happen randomly?

As it doesn't happen when you don't use your computer, I do think it's some sort of hotkey thing. Maybe you can try to press buttons you'd press in Maple while not playing, and see if it happens too then.