I found a way to temporary fix the "Grain/Static Bug" problem:
**Method 1** When you see it turn off your console. Restart the game, go to the Main Menu, and reload the Campaign Chapter you were playing from the beginning with "Repeat Mission". You will get the default weapons of the level, but the bug will disappear.
It seems to be a problem with "Resumed Savegames" in the middle of the levels...
**Method 2 (if Method 1 doesn't work for you)** Turn Off your Console. Restart the game, go to Multiplayer->Private Match, and launch a Private game with only you inside. Just let the map load, and go around the map. The problem should disapear (even on Campaign side, just reload the Chapter from the Beginning like in Method 1)
Let me know if it works for you. It worked for me
