I've noticed, that this Problem only apperes, if i'm working with multiple Workspaces in gnome. Usualy, i've put the VM on the Second Workspaces.
Since i left the VM on the first Workspace (so, total one Workspace), this Problem won't accure. Before, this happened after about 1h. This is what i can say after about 8h of work.
To be sure, i will test this furthermore.
I've noticed, that this Problem only apperes, if i'm working with multiple Workspaces in gnome. Usualy, i've put the VM on the Second Workspaces.
Since i left the VM on the first Workspace (so, total one Workspace), this Problem won't accure. Before, this happened after about 1h. This is what i can say after about 8h of work.
To be sure, i will test this furthermore.