why does my iphone keep freezing when i get notifications while watching videos?

My iPhone 11 Pro keeps freezing when I get notifications while watching videos. It happens across multiple apps (TikTok, instagram, what’s app, apple fitness plus are a few where I’ve noticed the issue). Unsure if this is related to the issue but the camera takes about 10 seconds to load when opened from the Lock Screen. All the software is up to date, I’ve restored the phone and set it up as new and it still happens. Any advice would be appreciated