Character freezes when I try to record a demo

Sometimes when I am in game and try to record a demo, my character freezes. I cannot move but I can hear everyone around me moving. My mic doesn't work at that point so I have to type retry in console, reconnect to the server and start the demo over again. The demo works when I try on reconnect.

I've seen some error messages pop up in my console when this happens, so next time it occurs, I'll make sure to post the console details. This has also happened in the past, so it's not specific to 2.41.