My iPad Air 2 is keep shutting off and hard to turn on, no matter how many times I try it turn on and shut down itself. Is it battery problem or something els

I suggest you search online to locate and call contact your nearest, “local” Apple Store location to try/attempt to make an appointment to get your Apple iPad Air 2 diagnosed and option presented to you.

OR, failing that,

Contact Apple support via the contact support link located at the upper right hand corner of every Webpage of these Apple support communities.

Use the Hardware, Battery Device Performance and Connectivity support categories. to post your issues in.

OR

by installing and using the Apple Support app found in the iOS App Store.

Tap the iOS App Store link below.

https://apps.apple.com/us/app/apple-support/id1130498044

OR

Call contact Apple via the support numbers found in the link bekow.

Contact - How to Contact Us - Apple

https://www.apple.com/contact/

Best of Luck to You!