iPhone XS keeps going to lock screen
Yesterday my phone started reverting back to the lock screen after I'd start reading an article that I searched for or opened up. Would start reading, scrolling down and then after a few seconds it would close and go back to the lock screen. Can't do any research on phone now because it won't allow me to stay on the article long enough to read it.
What can I do to prevent it from reverting back? I've updated it to 13.5.1 already and would prefer not to reset the phone to factory settings.
iPhone XS, iOS 13