Alright, I went to play Natural Selection (HL1 Mod), after being in a server for 5-10 minutes I get an error saying: "Steam Connection Lost". Nothing more, nothing less. This can't be a router issue because it was working not even an hour ago (and it has worked for the past year).
YES I GOOGLED THIS ERROR ALREADY, SHEESH
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Connection lost, is just how it sounds. Have you done anything to your computer prior the problem? And have you checked your firewall and open ports to check and see if traffic is getting through? Here are my suggestions.
If all fails scream at your Router/Modem, Good luck
Dont worry about what Sgt said, if someone logged into your steam account you would be asked to re-enter your password because "your steam ticket has expired"
There is also a connection limit for cheap routers like mine, they reject packets when the limit is reached and you have to wait for 2 min for it to free up
Did it ask you to Login again? If so, somebody else might be using your account, and when they logged in, you were kicked off.