Logic / OS X randomly losing communication with firewire devices

Hi
Connected to my MBP I have a Lacie FW drive with an Apogee Duet daisy chained to this.
During a Logic session yesterday all of a sudden I received device removal (warning) messages for these two items although they were still connected to the relevant ports!? I also had to force quit Logic following this.
When I reconnnected the devices were recognised but things were still not right as when I tried to change the volume on the duet the system was very slow in responding.
I was running of the battery power but this has never happened before whether connected to the mains or the battery.
Any ideas/should I worry?
Everything seemed fine a couple of hours later when I restarted the system but I am uneasy about the potential for this to occur during a more important session.
Any advice greatly appreciated
Cheers
Sam

Hi Sam
I have an Imac, same operating system as you (10.5.8) and also the Duet. Also got a Lacie external hard drive. i have also encountered this problem in the last week. however, I have had this problem in both Logic 9.02 and Record so it seems it isn't just a Logic problem.
One question - was Airport on when you lost communication with your hard drive? My was and when I turned it off the problem has not occurred again. It may have something to do with it although I'm not technically minded so I wouldn't know why.

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