iPad overheating when using notes and Apple Pencil

Hi,

I have the 2020 iPad Pro 12.9 inches. I have been using it for education, and recreationally for the past three years. I have recently noticed that it overheats when I am using it to take handwritten notes on the Notes app with my Apple Pencil. It becomes physically hot to touch and I have to take a break so I don’t burn myself. The battery also drains faster. Just now, I went from 67->33% in one hour while using the Notes app and Apple Pencil combination. Usually, the fully charged iPad lasts me two days if I do not take notes. This problem does not happen when I am using the Apple Pencil with other apps (for even longer durations). I have used OneNote, Procreate, Paper by WeTransfer, MediBang Paint, etc.