Iphone 11 pro max glitches

Hi,

I've recently noticed that my phone started glitching a lot especially when I open photo gallery. It will just quit unexpectedly. When I open camera I'm unable to take any photos because the screen doesn't respond. I was able to take a video and one photo in portrait mode but the switch between different photo modes takes ages to load. It's definitely not any kind of issue storage as I have plenty of storage space. I've restarted my phone a couple of times and even deleted a few apps but it did nothing. I got this phone in November 2019 and i was fine until about a month ago. Also the software is up to date and I haven't installed any updates recently.

Any ideas on how to fix this?