I have been plagued by this issue since day 1.
I mentioned it here:
http://forum.corsair.com/v3/showthread.php?t=179666
and here:
http://forum.corsair.com/v3/showthread.php?t=184738
I have had every firmware and nothing helped, actually the issue probably got worse...
Finally opened a support ticket last week, but no one from Corsair has looked into it yet, that's a +7 days response time.