Buffer overflow in net message

Yeah, so I've getting this error quite often lately.
I've tried to re-install GMod completely, but it doesn't seem to work.
It happens on almost every server when I'm trying to join it, and once in a while I am able to get in to the server. I have been searching on google, most people said that playing with 'rates' should fix the problem, but I've been trying almost everything.

Have anyone else experienced this problem, and how did they fix it?

Thank you,
Ultimate100