Even when I m watching a game it suddenly stops several times. The messenger connexion loses and also the lobby connection is lost. I don't know how to stop this. It is happening several times like while playing, while I m watching a game while I m just away for 2minutes.

Are you using a WiFi connection or a wired connection? If on WiFi, please check, whether you have the problem with a wired connection too. If the problem persists on wired as well, please double check your router or call your ISP, whether there is a problem with the connection. You could also run a ping to see, whether you have timeouts on your connection.