External Firewire 800 Drive Shuts Down

I am using an external Other World Computing hard drive enclosure with a Seagate 2 TB Barracuda XT drive formatted as a single volume. The drive seems to be in proper working order and I haven't lost any data. However, every once in a while the drive power light will go off and the drive will go off line. Then it attempts to mount, but isn't able to.
I have experienced this behavior with 2 Seagate drives in different enclosures, so it doesn't seem to be a problem with the drive or enclosure itself. Could this be a problem with the Firewire 800 port on my Mac Pro?
Any help would be greatly appreciated!
-Michael

Do your external enclosures use an external Power Supply? You may be drawing too much power from the FireWire cable. This problem is much more common with unpowered USB drive enclosures that have limited ability to get power from USB.

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