I think Crysis 2 causes the lose of my internet connection. When I start Crysis 2 and want to log in, sometimes the whole crysis 2 screen is frozen and suddenly my connection to my whole computer is down. It's the same if i search for servers while playing multiplayer. It freezes and my connection is down. So I can't do anything anymore(visting websites,skype).Earlier I didn't have that problem but suddenly it appeared and cause of that I can't play Crysis 2 online anymore. If i wanna play the singleplayer I have to skip the Log in. To get my connection back I have to unplug my router and plug it in again. What can I do ?
For any whop think it's just my router or something like that. This problem is only while using connection with crysis 2. Sry for my bad english.

If you reset your computer rather than the router, do you get your connection back?

Update Network Interface Card drivers as a start. What make/model of N.I.C. do you have?

yes by reseting the computer I get the connection back too. what do you mean with N.I.C ?

NIC=Network Interface Card (the device where you plug in the ethernet cable into your computer). If you have windows 7 and are familiar with device manager, you can update the driver from there under "Network Adapters". NIC drivers are finicky and version-dependent. Can you determine the make/model of your NIC?