Sorry it wasn't my intention to hijack this thread, perhaps i did not explain clearly:
"Often the net connection lags, or it is completely stuck, and often the system seems to sleep :-( "
I mean the Internet Connection does not renspond, while LAN seems in perfect order, connected, IP assigned, etc. but the Internet Browser (IE8, Google Chrome, Firefox) doesn't open any site, and after a while the system hangs waiting for something.... i don't kwow .
If i misunderstood what's been written in the first post, feel free to delete what i wrote.
Nicola
P.S. sorry for my English