My FW800 intermittently shuts down using the TB adapter.

When I use the Thunderbolt adapter to connect FW 800 drives to my new MacBook Pro, the drives shut down after a few minutes with a message that they have been improperly disconnected. I bought the computer about a month ago and have already had it computer checked and repaired (by Apple), but that the problem still exists. The drives do work properly when they are connected with USB 2.0 cables, but I need the USB ports for other peripherals and would like the additional speed of the FW 800.
I have read that the Thunderbolt adapter limits the power to 7W. Could this be the problem?
Rick T.

Hello:
As a preface, I do not read logs well at all 
I would try running repair disk when booted from your software install DVD.
Barry

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