Why does my IPad restart on its own?

My IPad (8th Gen) keeps on restarting on its own every 3 minutes, I've tried to restart it, delete large storage apps/games, but it still restarts on its own. Before it restarts, the screen freezes and it turns black and pink and green lines appear and disappear. I don't know how to stop this, I can barely use my IPad for over 3 mins, please I have important stuff in it. When I charge it, it shows 0% remaining, like how? The battery always shows a red line when I charge it, it won't even go away. Please help me, I need to fix this.