It started a few days ago.. After a few minutes of being connected and performing various tasks Putty just freezes.. It's the strangest thing I've encountered in a while, never had any problems with it at all. Keep alive seems not to have an effect, but Ctrl+Q seems to bring it back to life briefly.

This is really frustrating as I'm trying to install software that takes 30-90 minutes and requires my input at various times.. Any ideas, suggestions?