iPhone status bar rotation
Since updating my 2020 iPhone SE to iOS 15, I’ve had four or five instances of the task bar rapidly rotating to the right-hand edge of the display and back to the top. This seems to happen primarily when opening or switching apps. The phone was being held steadily and vertically each time this has happened, and the apps being opened looked and behaved normally.
As this has only happened a few times, I cannot say if it is particular to specific apps.