Android 9 - Graphical freeze but scene runs in the background

Hello fellow Unity devs :D

I have a little problem. Everytime when I try to switch scene (From MainMenu --> GameScene) on my phone(Android 9.0.1, OnePlus 3T) the screen freezes. In the background I hear the sound and the music of the game scene but I still see the loading screen of the menu scene.

Strange thing, other Android 9 phones work without problems and my phone worked also fine when I had Android 8.0.1 installed.

Did anyone of you ever have a similar problem or maybe knows what the problem could be here ?

Thank you for your help and have a nice day :D