I've had the same problem. Mine is a hard-wired ethernet connection. I've followed the advice from a number of other threads which have helped a lot on some fronts. I still get the same problem though, that after a few hours, my computer loses its connection to the ethernet modem and I get a message from LW saying that I don't have an active internet connection. This happens after about 3-4 hours and I also have to unplug the power from my ethernet modem and power it up again to re-activate the connection.

Anyone have any ideas? Any help would be appreciated.