Not being able to enter breakout rooms

Hello, there has recently been a problem with access to breakout rooms (smaller groups) in Zoom. Does anyone know why this is? Many people are complaining of inconvenience, but I have no idea how to solve it. 😞 Please help me.

1. Based on mobile (phone models vary)
2. Unable to enter the room and a black screen appears or freezes.
3. Rebooting the phone and reinstalling Zoom and logging in do not help.