Penny Arcade's Gabe tweeted (warning: foul language through link) that he had encountered the issue several times. Meanwhile, Infinity Ward's man in the trenches, Robert "fourzerotwo" Bowling, confirmed the issue is known and that a fix is currently in the works.
[Via Gaming Union]
Source - cwgabriel [Twitter] (NSFW)
Source - Robert "fourzerotwo" Bowling [Twitter]