FW800 external HD and FW400 interface --- problems?

has anyone had problems using a firewire based interface (like the presonus firebox, what im using) and an external HD using firewire 800 (g-tech's g-drive Q is what I'm using)?
This just happened. Turning on the HD causes tiny clicks/pops from the interface output, only briefly. the cloff falls out of sync for a sec. any app playing back video or audio suddenly wont play audio anymore (nothing comes out the speakers). Both are connected to the firewire ports on the back of my G5.
turning on my FW800 external HD effectively kills my interface. i have to restart the computer or turn the interface off and on again to get it going.
why is this happening? this is hugely frustrating. I only intended to use the external as backup for files and projects, but if I'd wanted to use it to stream samples I'd be mighty screwed...
...what gives? I'll probobly call presonus tomorrow and ask about it, but I thought I'd try here and see if anyone experienced similar issues. can I not use fw400 and fw800 simultaneously? is it because they share a common bus, and then suddenly theres a conflict?
thanks in advance
chris

I can only relate to you my good experience using a FF400 on the 400 port and a LaCie HD on the 800. Never a glitch, despite my macbook's architecture sporting only one firewire buss !
In theory, you should be able to use both at at once.
ps. i can even use the FF400 on bus power, with the 800 HD churning away quite happily.

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