T. Permi, welcome! We were having some issues with the forum yesterday, so give us all a bit. I also don't have touch screen, so I cannot help this time, other than giving you some options. Do you have a screen protector on it? Possibly there is "dirt" trapped so the camera sees it as being touched, so your finger touch won't matter. Look in recent settings (or whatever it's called) and see if anything was changed. Remove the screen protector, maybe after trying other options if it can break and be unusable or dangerous. If you have User 1 and user 2, switch to the other user, maybe it is different. Reset the menu options. Let us know what works to correct it please!
Rob