I got the Buffalo LinkStation(network storage) yesterday.I immediately connected it to my router,and set it up.All worked fine until I tried to move my movie collection(average file size 700 MB).It first said it will take 5 minutes,but after 1 minute it froze,saying it couldnt connect to the LinkStation.My Laptop(Vista Home Premium 32bit,Asus X72V) then disconnected from the router(also no internet).after reconnecting i tried a music file,which was transferred in a matter of seconds.
My other Laptop doesnt disconnect,although writing to Linkstation is awfully slow...

What can i do?
(In the moment i directly connect over ethernet-less than a hour for 50 GB-i have a modern laptop,300 mb wlan)