SHIFT or CTRL keys stuck randomly with higher keyboard rate

Hi,
I’ve set a higher keyboard rate in the registry:

[HKEY_CURRENT_USER\Control Panel\Accessibility\Keyboard Response]
"AutoRepeatDelay"="200" 
"AutoRepeatRate"="6" 
"DelayBeforeAcceptance"="0" 
"Flags"="59" 
"BounceTime"="0"

However, when playing SC2, SHIFT or CTRL keys stuck randomly, which messes up control groups and camera locations. How could I solve the problem?