Is autodisconnect turned off See:-http://support.microsoft.com/default.aspx?scid=kb;en-us;297684&Product=win2000
And make sure the laptop don't have powersaving enabled or going into suspend mode, especially the machine where the data resides.
>>Are the laptops hard wired or using wireless access to the network,if the later get the client to get rid of the wireless.
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>
>They are hard-wired. No wireless involved.
Regards N Mc Donald