Display flickering

I had same issue and then display completely stopped working. I would advise making a backup asap. It seems to be common issue impacting iPhone 13s with recent updates. Sorry not to have better news, if you’re still within warranty get it replaced!

My phone screen & my husbands will flicker randomly like an old tv almost. Not sure if that’s what yours is doing too??? Does anyone know why? How do I fix it?