I have a problem when I try and join a server. I join the server and I join the game but before I can start playing it disconnects me and it says "Error verifying STEAM UserID Ticket." I've been playing for about a year now and it's never done this before. Can anyone tell me what's wrong?

Does this happen all the time or just occasionally?

I found this (http://support.steampowered.com/cgi-bin/steampowered.cfg/php/enduser/std_adp.php?p_faqid=30&p_created=1092275064&p_sid=rgjFQO2i&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9MTQ5JnBfcHJvZHM9MyZwX2NhdHM9NTIsMCZwX3B2PTEuMzsyLnUwJnBfY3Y9MS41MjsyLnUwJnBfc2VhcmNoX3R5cGU9YW5zd2Vycy5zZWFyY2hfbmwmcF9wYWdlPTEmcF9zZWFyY2hfdGV4dD0iRXJyb3IgdmVyaWZ5aW5nIFNURUFNIFVzZXJJRCBUaWNrZXQi&p_li=&p_topview=1)
Hopefully it will help you out.