Apple logo loop help

My phone is stuck on a continuos loop of the Apple logo. My Iphone 5 running on IOS 8.3 won’t respond when i try to turn the phone on. I hit the power button multiple times and try everything but it will not turn on. When i plug it into a charger though, it shows the screen as if it were dead but charging,(the empty battery but no charger cord symbol) and switches to the Apple logo screen as if it were booting up after it was dead. It repeats this forever but sometimes im able to turn it on but after awhile it shuts off at full battery and repeats the loop. I’ve tried a hard reset and plugging it in to Itunes but neither helped. Any help would be appreciated.