Restore it. That worked for me. No issues at all now.I have the same issue. Open any app. The app takes 5-10 seconds to open. It crashes. Open it again. It takes 5-10 seconds to start. Then, scroll or switch tabs or press a button, and its slow to respond taking 5 seconds for an action to perform. This ia true for all apps, system or 3rd party. I cant use my phone now. iPhone 7+.![]()