iphone 7 camera not working

so, lets start.

when i bought this iphone, the front facing camera was working just fine, but after a while it started showing a black screen on the camera app when I tried to open it and if I went to social media it wouldn’t even turn the camera. After a while it started working again, and then it stopped, and then it started working again. now it’s not working.

restarting or resetting doesn’t do anything, and i think there might be something that triggers the camera to not work from time to time.

any tips?