Why does Sin call the internet every few minutes and freeze my mouse out?

Every so often while playing single player small map (am brand new to the game) Sin try to connnect to the internet and when I block the transmission my mouse no longer works in game. I keep getting site certificate revocation errors. HINT: thats how I blocked the signal. So its reaching out, when it hits my firwall it gets sent back random data until it gives up. I know thats why the certificate errors are showing up. I'm guessing the mouse issue is because I don't click "no" 15 times to get the game to stop trying and the game still thinks that it has the top Z layer when the cert error alert does.

So I can move the cursor around but not click on anything. Very annoying.

Ok so why the hell is Sin connecting to the internet during a single player game... and where is the patch to make it stop?