I'm not sure if it's a bug, but I put my notebook in hibernation (waited for the screen to turn black) then placed it inside a thick notebook sleeve & inside my bag.

While walking, I noticed my bag getting a bit warm, & when I opened the sleeve, my notebook was booted and waiting for my password.

The battery was also close to dead and the notebook was already hot from being cooped inside the sleeve while on boot for a while.

Is this a bug with Fujitsus? Or just a Windows setting thing? I'm a little scared I'll end up with a dead notebook, if this happens again. Do I need to update something?