Counter strike 1.6 connection error problem

Hi all, I am getting an annoying problem that persists every time i play counter strike 1.6. When I first connect to a server it is all fine for about 15 seconds then the game freezes and on the top right hand corner it says "Connection Problem". I have to disconnect from the server then reconnect to the same one for the problem to go.

This happens on EVERY server so its starting to annoy me. My connection is wireless and its quite speedy, i've never had connection issues, my computer can play counter strike 1.6 fine and when i played it last year I never experienced an issue like this.

I have re-installed it and still get the same problem, can some one please help me.

Thanks all

Nope its broadband @ 2mb/s but im on wireless and its still fast.. I'll see if it could be my firewall but atm its still going on..:/