First, sorry for my bad english.

I have a disturbing problem..

if im not alone in a channel, it starts lagging. But not anytime. Mostly, after i reconnected my connection.
If i switch the channel and im alone - lag is gone. If i stay in a channel with people, it lags and im losing connection.

Something similar happens in a game named "Assault Cube". If i reconnect and join a server - it lags and i get a disconnect (server, not connection).

So... i have no idea what i should do :/