Notes App Heating up iPad and Draining Battery

Hello,

Until yesterday, I have always used note-taking apps such as "Notability" or "Good Notes 5" for note taking. However, I had to use Apple Notes to write down something quickly and had to continue using that note. Ever since writing on Notes, my iPad has been heating up a lot (feeling uncomfortable on my hand) and draining the battery very much (30% in less than an hour). Not only this, but it constantly lags and glitches when writing or erasing. Normally, I do not heavily use my iPad but on the rare occasion I do, no heating issues occur when using the other note-taking apps (even if iPad is on for multiple consecutive hours).

I have tried all suggestions which include clearing all applications from recent, restarting the iPad, disabling background app refresh, turning off iCloud Sync, and putting it in airplane mode but nothing has seemed to fix the problem since the minute I started writing again, the glitching continued and was later followed by the heating.

Is there anything that can be done? Is this issue software or hardware based?