Air 2 Continuously Restarts

So I’ve got this customers iPad Air 2 here. He brought it in and said that it just keeps restarting. He said he took it to apple a couple of years ago and they told him the issue but he doesn’t remember what they wanted to replace. So my colleague suggests changing the battery, this fixes nothing. The iPad will sometimes come on if you hold down the power and home button , and will always come on as soon as it’s plugged into the wall or a laptop. After maybe 2-5 minutes, the iPad just turns off. Sometimes it’s still on when I long press the power button; but most of the time it’s just bootlooping. Other times if I unplug it and don’t touch it , it will say on for hours. Any suggestions?