PHONE WONT LET ME SCROLL

My phone has been acting up sometimes won't let me scroll up and down like when I want to clear open apps or sometimes when I want to adjust the brightness and I was kinda ignoring it cause like idc but now Instagram scrolling was like lagging and It wasn't letting me unlock my phone like you know how you gotta swipe up to unlock I had to ask Siri to open my safari to get in I'm scared it just gonna stop working in general like the touch of the screen what is wrong with it ? Do you know and where can I fix it also It won’t let me swipe to power off