I'm having this same problem, but I'm not overclocking, not running anything weird and I'm not running radeon.
When I push the hat switch that I have assigned to the look front up it locks in that position like it's a latched command and resets itself to the base view. No other views on the look up hat function. All are still correctly bound in game. Hitting ESC returns my view to normal. Sometimes it also brings up the clipboard, sometimes not.
Also, my view was consistently sent askew when loading vehicle supplies. Changing positions and returning to the gun was the only way to fix it.
Any ideas?