@niclwoo
I don't what the hell nigel is talking about so take his post with a grain of salt.
I'm not experiencing any of the problems you mentioned, are you sure the problem isn't on your end? I have a bunch of people on my friends list all playing crysis and none have complained about having any issues connecting/disconnects. Does this happen with any other game? Check your router/internet modem to make sure it's setup properly and do a quick power-cycle(power down modems/routers for 30sec). Good luck!