Hi, welcome to the forums.
I'm not familiar with your problem or the specific hardware you mentioned Or is it s/w? never mind.
How are you capturing. How is the camera connected to your computer? What h/w does the line go through.
One thing that has cropped up regularly ( and wuite recently) on here is that of captuyring through a firewire port on the motherboard and/or graphics card. If this fits your scenario then be advised that these do not always work the same as PCI firewire ports. Change to a PCI card firewire port and see if that helps. SOunds silly but more than one punter here has been pleased with the change
If that's not it give more information as to h/w used s/w used, how it's all connected and the settigns used to attemot capture.