CS 1.6 problem with ping being 500

As the topic says, I'm having problems with my CS 1.6's ping. First, let me just say that I've been playing 1.6 for years and have my config setup well and have all the rates changed to where I like them. The problem starts slow and escalates as I play more and more. If I restart my computer and get into the game, it will run fine and smooth. Then, if I get out of the game and come back in it starts to do this thing where every 5 - 10 seconds it has a 1 - 2 second hiccup. It is definately a lag spike not something with FPS. It will do that for awhile then if I come back again later it will always have a consistent ping of about 500 in every server. Once I restart though, it goes back to the beginning of the cycle. I've tried everything I can think of and searched all over the internet to no avail. One thing to note is that it only happens in 1.6. COD2, MW, and CSS are all fine. Any help would be appreciated. Thanks.

PS. I have cable internet with about a 6 MB down and 1.5 up. I have a router that I am wired through. I'm not sure what else you need but just let me know.