Screen Freeze
Apple iPhone screen just started freezing up all over the place a few days ago. A FORCE RESTART is a bogus sln period. it’s happening 4-5x a day. Fix it!
iPhone 7, iOS 15
Probably a battery issue. What is your reported Battery Health at Settings > Battery > Battery Health & Charging > Maximum Capacity?
If your battery has not been replaced yet on an iPhone 7, they you are most likely way overdue and you will need to have it replaced. Any Maximum Capacity reading under 80% is problematic.