When we run our FoxPro DOS (2.5a) app from our network, we often lose our network drive mappings (message "Cannot access drive G:" or something like that). What is interesting about this problem is the following:

-- While only the FoxPro DOS window loses the drive mappings, other DOS or Windows sessions running on the same PC (under Windows 98) still can access that network drive mapping!!
-- We've only noticed this behavior since we switched from 10baseT and Novell 3.12 to 100baseT networking with Windows NT 4.0
-- This only seems to happen on some of our faster machines (in particular one Pentium III 550 MHz PC)
-- This problem does not always happen - or even in the same place in the application.
-- The application itself has not changed.

All of the above seems to point to a problem with faster computers and/or networks.
Does anyone know anything about any such problems? Any information about this would be much appreciated.

Thanks in advance for your assistance.