Again me - scene freezes after deleting it and adding it again!

Hey!

So I have made a menu setup for my game. There is a main menu, an in game menu and a menu for the options.
When I start the game and open the in game menu the game scene will be suspended, if I close it again it will be resumed.
When I open the main menu scene via the in game menu, all scenes will be ended and the main menu scene will be added.
So now there is only the main menu scene (confirmed with print(logic.getSceneList())).
But when I now open the game scene again via the main menu the game scene will be freezed after like 20 frames.
I can’t do anything except for opening the in game menu. When I close it again the game scene will be unfreezed again for like 20 frames.
And the console is printing a lot of “Blender Game Enigne data has been freed, cannot use this python variable” errors.
Has anybody an idea why this could happen?!

Thanks!