Beverly says that after the last iOS 13.4.1 update on her iPhone, she has to reboot her phone to run any app. Leo suspects that the update was corrupted when downloaded. He recommends backing up your phone and then wipe it and reset your phone. Connect the phone to your PC via USB and then use iTunes to run the encrypted backup and wipe it. Erase all the content and everything. See if that solves the problem. If it does, then you can restore that backup. Here's a guide to help: https://support.apple.com/guide/iphone/back-up-iphone-iph3ecf67d29/ios.