Rainbow 6: Vegas problems.

I seem to be having a couple of problems when playing on multiplayer. One is that very often weapon sound will repeat in the background for minutes at a time, which can get very irritating; and the other is that sometimes, usually about 20 to 30 minutes after I' ve started playing, the game will just freeze, and the only way to remedy this is to restart the console. Is anyone else having these problems? Does anyone have any idea what they could be attributed to? And does anyone know if Ubisoft will be realeasing a patch soon to maybe fix this.