Persistant Lag Spikes on GMOD server

[Ronoman]

I have had a server up since late June, 2-3 times per month my server has this issue, where the server lags, shows the auto-disconnect and freezes for a few seconds, after that it plays the sound from spawning and continues to do that every minute. Usually when it would do this i would just delete my entire SRCDS folder, re-download/install everything and it would work for a couple of weeks. But this time that did not work. Has anyone else ever had this issue?

Any help would be greatly appreciated.
-Adam

PS I made a youtube video of whats happening, feel free to view it.
http://www.youtube.com/watch?v=B75wwGZYaCE