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>Do you mean you have the two computers direct-connected without a switch in the middle? If so:
>
>- are both computers on UPSs or otherwise protected from power spikes/static etc.?
>- are both computers well grounded with no chance of a ground loop between them, which might show up as a voltage potential on the interconnecting LAN cable?
>- could you repeat your tests with a switch in the middle?
>- is there any difference if you manually set your workstation speed to 100Mbit instead of gigabit, to force the slower connection for test purposes?

Hi Al. Yes there is no switch between them and they are on a UPS. The other items I will need to check with the networks guy. Thanks. Wierd thing is that the problem seems to be getting worse. It used to happen occasionally, maybe once a month. Now it can happen even every day.

I have noticed that a black exclamation icon appears in a yellow triangle in the system tray every time this happens. If you mouse over or click the icon it disappears without any tooltip or menu options.