ipad pro get hot when not in use.

Hey guy and girl my ipad pro 12.9 inch get hot without me even using it. Also for some reason it hot and the battery is completely drain for some reason. When I fully charge it unplug it and then leave it overnight. It happen every morning my ipad pro just die on me. I also don't jailbreak my ipad pro so do you guy/girl think it a virus or some kind of a malware running on my ipad?