I've got the same issue. Have had similar issues with F key as well as the right mouse button for aiming and not aiming. Really dumb as that when the key quits working you can go in to options and reassign the key (to itself) and upon exiting setup it is as though you pushed the key again. Sometimes even happens with the left mouse button when firing. Game is full of these keyboard mouse issues on PC. It is just when you get to the cabinet there is no real workaround to get past it.
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