My phone is Nokia 3.1. It uses android oreo 8.1. I have an issue with picture in picture mode when playing video in apps supported this mode like chrome, firefox, youtube. When playing video in full screen, it switchs from full screen to picture in picture mode without touching screen or pressing any button like home or any others. It keeps change to picture in picture mode without any of my intention. I try to reinstall several times these apps and soft restart my phone but it didn’t work. I end up turning off this feature because it starts inconvient and trouble. And more than that not just apps supported picture in picture, other apps having playing video like Smule, Youtube kids, … the video in full screen turned in small player while watching video without any touching screen or pressing any button too. I really frustrated. Do you have any ideas what’s wrong with this?