iPhone overheating, battery draining and slow performance
Why is my iPhone 7S overheating quickly?
Why is my phone battery draining so quickly?
Why is my phone so slow? A couple of days it was working great.
[Re-Titled by Moderator]
iPhone 7, iOS 13
Have you tried a restart? Or a hard reset? Hold both On/Off and Home buttons , ignoring slider, until Apple logo arrears. Then release buttons. The phone will reset and you will lose no data. Worth a try...