I have same model too but your problem is different . Is there any water jam on your camera? Is your camera version up to date? Do you charge your battery well? You can try this ? https://youtu.be/f36DfW-j7os Regards , Berke.
Hi @ekhp , Did you go to an Apple store ? Of course who does this they don’t tell you thats service fault . I done some research and find , you never use alchol in cleanıng because thats harmful for color of screen and phone .( some videos says use alchol but you never! ) Best choise is go offical service or Apple Store .
You shold go nearest Apple store or authorized service . But for use your phone ın few weeks you should activate assistive touch in settings . This is a screen home button . Go to settings>General>accessibility> Assistive touch (ın scrool down) Thıs ıs ı know only abouth this topic. You should go Apple or service . Regards Berke