They do. I started seeing my phone not getting fully charged during the night and driving on a bumpy road would make the screen turn on and off. Took me a while to realize that a small lint ball from inside my pocket had made it into the USB C socket of my phone. It was small enough not to be overly evident. Few minutes with a toothpick and it's good as new!
Yes! Exactly what happened with my Pixel phone. The cable would fall out after a minute. Took a toothpick and a few minutes to get the dirt out and now it's as good as new.