L4D2 - Help! Stucks when playing online

[Puliyo]

I have recently purchased l42 on steam and whenever I play the game online, in random time my player stucks and no control except moving eyesight (moving mouse) is accepted.
While I'm stuck, I can see other players (and zombies) moving but cannot see the action they do while I can here the sound of actions they do.
And if I leave it like this, in about 1 minute, I get jumped to the main/starting screen of l4d2 with pop-up saying 'time out'.
Any solution to solve this problem will help.
Thanks.

[My{BooM}Stick]

did you check the game system Requirements

updating your driver

[Puliyo]

Satisfying system requirement but still happens.
Driver up to date
My graphic card: ATI Radeon HD 4800

[-.B.O.W.-Killer-]

As this is only happening Online, i would say that its your Firewall blocking something or your internet connection sux. Also are you using wireless?, if not check your ethenet cable. Wot is your ping when you join a game?

[Trnust the pillars]

sound like your ping is high or sever dont accept high ping also this happens to you when you play single player?

[Puliyo]

Not firewall for sure as its disabled.
Not wireless, cable. Tried with two different routers.
Checked ping in one game, t'was 35
Sorry guys who were playing with me just then. it happened again.

[Lord Snow]

It happens if your connection is not good enough, do check your connection, check your ping by pressing Tab too, and ya, firewall or antivirus option might be blocking the connection to server. Its not graphics driver issue. Connection issue mostly.

[Puliyo]

Solved after getting good connection.
Thanks for help guys