home button works intermittently or only after several presses

I have an iphone SE. I want to return to home screen after watching utube. I have finger print id. Sometimes I get back the homescreen with one or 2 presses. Other times it takes as many as 10 presses, doule clicks etc before it exits from utube and get back to the home screen. I have not tried with other apps as we only (currently) use this iphone for utube. I cannot get to the utube search page i to seek another video to watch without quitting utube app and restarting it.