If you are concerned in any way for the health of your iPad, your best (if not only) realistic option is to entrust inspection and test of your iPad to those best qualified - and in possession of the correct tools. This will be the manufacturer, Apple.
You are best advised to seek assistance directly from from Apple Support - and request a remote diagnostic test.
You can contact the Support Team using the Support link at top-right or bottom-left of this page. Alternatively and perhaps easier, you can initiate and manage your support cases using the excellent Apple Support App. If not already installed on your iPad, the App can be downloaded from the App Store:
https://apps.apple.com/gb/app/apple-support/id1130498044
You might also visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your iPad.
Genius Bar Reservation and Apple Support Options - Apple