Hello Sunshine, and welcome to the community.
It seems you have several uncommon issues with your phone, that are not acceptable.
Have you tried to contact support? Unlessed you’d have damaged your phone, your issues would definitely be covered by the warranty.
What you could do beforehand would be to unmount and remount your phone, especially the screen and camera modules, since there could be a loose connection. Of course, this will not void your warranty, if done properly: be careful with the connectors.
Could you elaborate on these please? What do you mean by hidden privacy settings? How slow? When doing what? What happens with the touchscreen?