iPhone crashed

Hello. Something is happening with my iPhone since yesterday. So yesterday for no reason my clock, battery icons which are in the top of the screen rotated itself to the corner , while other apps was okey. In a couple of minutes it fixed itself.

today like a couple of minutes before while typing my iPhone got half black screen with colorful stripes and then fast restarted. It works now. I’m using iPhone 12 Pro max I got it this year and I haven’t drop it. I don’t know what to do.