Both computers lose the connection at the same time. Both are Toshiba Laptops that are using Ethernet wires to the Router. NIC's are integrated with the laptops. One runs WinXP Pro, the other XP Home (missed that on my last post).
This also happens regardless if the firmware is updated or not (I know how to fully reset the router to factory-fresh pre-flash).
Router, as I said, worked perfect in the last place we lived.
And once again, the connection does not drop if I connect directly to the plug that runs to the flat (to the termination point from the ethernet distribution for the various flats in the building as opposed to using the Router).
I will try disabling the wireless side in a few days when I return. In the meantime, any more ideas? Again, thanks very much.