iPhone 8+ has gone crazy
My iPhone does weird things. From time to time, the app icons start jiggling and the focus on an app will open and close spontaneously. The affected app (I don't think it's one particular app - I keep everything updated and I'm on iOS 14.3) will not respond to my touch - things jiggle, open and close without me touching it. I can hold the phone and see this bizarre behavior without touching the screen.
The only thing I can think to do is restart the phone.
Any thoughts on what to do?