freezes after update

Hello everyone :) I immediately apologize for my possible mistakes in words, I ask you to blame Google Translate. And now to the problem. After upgrading to version 12.5.3, I got stuck even in the simplest applications, for example, "calculator", while no third-party applications are open. I have not downloaded Jailbreak or similar applications. I understand that my iPhone 6 is a relative of a dinosaur that accidentally survived an asteroid blow, but I don't have money for a new one, and I would like my phone to live at least another six months. If you know how to solve the problem, I will be very glad for your help. Have a nice day, everyone:)