Happen all the time. I can't finish even a single match with this problem sticking around me.
This happen to all servers whether lag or not. Even if I am in a local server with 13ms ping, I still get disconnected.
NAT Type is always moderate. I can't get it to OPEN even if I port forward. UPnP doesn't seem to work. I disabled all firewall on my router (Actually it never was turned on) and on Windows 7.
This issue isn't that frequent during my Crysis 2 Beta experience. I still can finish a lot of matches that time. But now it's every single match!
3 most frustrating issue I encountered is...
1, I can't login the account at gamesas.com that I used to login to Crysis 2. (This is just alternative account for complaining and no, I do not want to stick to this account)
2, I can't redeem my Limited Edition code because I can't login to gamesas.com.
3, This!