VoIP lag

Hey there,

I’ve got a little problem whis my GMOD.
Sometimes when i press my push-to-talk key i get a gamefreeze for around ~1 sec.
This only happens if i talk the first time or if i didnt say anything for around 20 secs.

Thats a bit annoying especially when i play ttt and getting killed by a traitor …

Also i want to say that i am pritty sure that my PC can handle GMOD ^^ its running smooth on ~130 FPS on best graphics (if i say nothing -.-)
My graphical drivers are also updated and i dont have any problems on other games.

It would be nice if someone had a solution for that.

Sorry for my english im german :s

push – No ideas?