It happend alot recently, to be more specific i think since i bought Spiky hair. Somewhen in all Lobbys the game freezes and stops responding, it seem to happen at the Start of a New round but rarely it happens in the middle of the match

This doesn't happen in singleplayer?

didnt notice but thats probably because i rarely ever play sp :P

This sometimes happened to me too, usually I can't kill toribash.exe using Task Manager when it's not responding(not sure about Fluxorious).

no i always could alt+del to acces taskmanager and kill toribash ... but if not you could still use cmd to force kill the task. But its really weird for example today it didnt happen even once yester it did and about a week ago nearly every match

Try turning obj models off to test if its the spiky hair/3d items