I wonder if you have a faulty one?
My 585 supports
Three desktop PC's (wired network)
A seperate AP besides the built in wireless
A print server
A Laptop on wi-fi
A EeePC on wi-fi
A network storage device
It as never given any problem at all and I find it much more stable on the broadband connection than my vigor 2600 although much less expensive.
I also use the DMT software to limit the DSL sync speed making the 585 very stable over night when the snr drops due to line noise. The vigor fell over every night causing the BRASS to be a mbps lower than the line could really support.
Ken
Zen Active 8000
Middle age is when your classmates are so grey, bald and wrinkled that they don't recognize you.
-Bennet Cerf