I have a SafCom modem/router with 4 x 10/100 ports for 4 PCs. It usually works fine but occassionally it loses one of the PCs i.e. on the front panel there are lights to show ADSL is up and for each 10/100 port is a PC is connected. Sometimes the ligth for one of the PCs goes out and it cannot connect to the internet nor to the other PC off the other 10/100 port. The only way i find of curing this is to switch the oruter/modem off for an hout of two then on switching it back it discovers the PC and all is fine. Any ideas on what is going wrong?