Anyone got issues when running games on steam that it closes for no apparent reason when playing online games, and then later kicks you off the game for not being logged in?

Copy this URL into Internet Explorer and press enter to force steam to run a System Assessment
steam://support/?Issues=*
If you have issues viewing the report then find this file and open it with your web browser.....
file:///C:/Users/username/AppData/Local/Temp/results.html
Sorry, I'm a noob in some of this stuff, but where does one check for the router's firewall?