Update dec 2012:
This issue also exists in Black Ops 2 but it’s a bit more subtle/rare – the fix is the same though!
I used to have some problem
with the mouse sensitivity in MW3 skyrocketing and then being normal and then skyrocket again and so on.
I read on various forums that turning off FRAPS would help, only problem is I dont use FRAPS or have any software like that running. Also read that lowering the pulling rate on my gaming mouse would help – I did not care for this since its one of the reasons I bought it.…