Strange SSH behavior (revisted)

I am still having problems with ssh locking up on me. I have tried a few things to no avail. When I log in from home to work I have no problems with ssh, but from work to home I get strange lockups. For example, I can type at regular speed for a while without problems, but if I do a 'cat somefile' it will immediately lock up on me. I am beginning to think it is my Linksys router. Does anybody have this router and has seen this problem when forwarding ports from the router? Thanks for any help.