My airport extreme crashes thanks to Lacie HDD

Hi all,

I have a airport extreme (5g) with a Lacie HDD (2 years old) connected to it in my living room.

Now when i'm busy on my HDD, copying stuff or watching movies, my macbook tells me that teh connection with the HDD is interrupted.

When I got that messege, my WIFI fails to. When I have removed the powercable and put it back, it takes the airport extreme a few seconds to restart.

So what can I do, so the airport extreme wont crash?!?

greetz