Loading of applications

My iphone 7 is not loading the applications. I have deleted them and now I am trying to re download them through the app store but it just keeps skipping and loading then making me reenter the passcode to access my phone. It is only loading instagram, it was not working for snapchat, facebook or Spotify.

I have tried to reset the phone by holding down the home button and lock button but it just takes a screenshot, even after 20 seconds. I have turned the phone off and on for a while and the battery is going down very fast. Any advise?

Text and calls still works!