Sounds like a problem with the LSI L-FW3227-100 chipset used on this board with graphics card... Texas Instruments should be the chipset of your choice for firewire... There are a lot of problems with others... Make sure, that graphics card and firewire are not sharing the same irq on the mainboard... Try moving your graphics card to other PCIe slots...
Try as well to set the firewire latency with the tool in utility folder of the MR Driver from small to medium or even large... If this all doesn't fix the problem, change your firewire chipset by deactivating the onboard one in bios and adding a pcie card with texas instruments chipset. If nothing helps, maybe change your mainboard to one with graphics onboard...
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