iPhone 16 blinking purple at the edge randomly.

I have experienced an issue with my recently purchased iPhone 16. Approximately three weeks ago, the screen flickered and displayed purple blinking at the edges. This behavior was not observed in iOS 18.1.1. However, since upgrading to iOS 18.2, the issue has become more frequent and occurs randomly for only four seconds before disappearing on its own. Additionally, the auto-brightness and true tone features have been activated.