I got worst here !
I got 2 computer un network the one the receive the internet and give it to the other computer don,t connect to UD or connect one time every two days and the other computer is always connected. It pretty strange !
I didn't lost any hours or point.
The computer that don't connect is on windows xp and the other one is on windows 98. I don,t think it because of windows cause it working once in a while on my xp machine. And I don,t have any firewall.