someone sent me a text and now my phone is locked up. cannot close the text or screen...

let the phone battery run empty and plugged in the charger. after fully charged it turned on and has worked fine. battery was at **% when I contacted for help. Phone was lockedmup, after leaving on charger over night it works fine?? *******************the screen on my phone locked up when a text came in, got on computer to a live chat on verizon. the tech on the other end could not do anything, suggest sending it in to be repaired or replaced. My battery was at **% so I knew that was not the problem,, no matter what I tried the screen was stuck on the text I just opened. it was late at night, frustrated I decided to plug it in for the night. In the morning I unplugged it and it has worked fine since. No clue, I just know it worked.