Participant can't hear after my screen's been shared - Audio problem

Hi, I teach using Jitsi Meet, but since August we’re having this problem. I share my screen and when I stop it and come back, there’s always a participant (usually the one who entered the room first) who can’t hear me anymore. He needs to refresh the page / enter again, so he can hear me. It’s been happening in all my classrooms. Since I need to share the screen many times during the lesson, this problem has been complicating the course of the classes. Does anyone have an idea, what could it be?
Thank you and have a great day!