ipad not charging
My ipad behaves erratic, some time not charging and at times shows 100% charged, but again after some time it is not charging.
iPad Air, iOS 12
That iPad is nearly 7-years old, now.
It is possible the internal, rechargeable Lithium-ion battery maybe failing.
I suggest contacting/reaching out to Apple Product support and services.
Tap on the first link below and scroll down some to get to the Apple Product Support section and phone numbers for your location/region.
https://www.apple.com/contact/
OR
https://support.apple.com/en-us/HT201232
Sorry & Best of Luck to You!