Ubuntu Studio 9.04 locks Up During Updates and Network File Operations

[deepee]

Hi

I have been trialling both the 64bit and 32bit versions.
I have been getting random lockups that seemed to be related to network 
tasks, e.g. copying a sound font file from the server to my desktop.
Have tried apt-get and get the same problem.
This is running as a dual boot installation on an Athlon dual core 
machine. The WinXP installation has no problem with the network.
Ubuntu 9.04 32bit on my laptop is running fine on the same connection.

Any ideas would be appreciated.

Thanks
deepee