Unet, Connection/Disconnection problem

HI,

I've a little problem with the new uNet system. I'm using a custom UI in order to create a host and disonnect from a server. I'm using the StartHost() method of the NetworkBehaviour class. Creation of the host and connection to it works fine for the first time, but as soon as a the host or the client stops, I cannot restart a new host or even reconnect to a host, without re-launching the game

Do you know why ?

Thank you in advance.