Windows XP SP3 -

Speratically the network resources will no longer be available. What I mean is the employee will be working away at an Excel, Word document or on the internet and the next thing they know Outlook will not respond, Mapped network drives will not respond. I double click my computer and it will not respond.

Things checked during network failure:
1. NIC link lights look normal.
2. Network connectivity icon on the taskbar looks connected.
3. Internet explorer works great during interuption.
4. Drivers have been updated.
5. If I do a Start/Run \\server\share I connect instantly to the drives that are mapped. If I double click on the mapped drive in my computer "no response".

Things I know that fix it.
1. Log off and back on.
2. Unplug network cable and plug back in.
3. Reboot

I'm convinced it is network related but don't know how to pin point it.

Any thoughts?