Thanks so far...
What happens is that the PC becomes disconnected from the wireless network, and broadband becomes unavailable. Trying to repair the wireless network using the windows facility does not work, so there is some intermittent problem. It is at the PC/wireless end that the problem arises, because,
1.- the iphones are unaffected, so the router is fine
2. -when I use a cable from the PC it connects to broadband OK.
I can only reconnect wirelessly by re-entering the password. Once this has been done the connection remains stable for a day or two.
I am counting the '*' s where the password is, which is how I am guessing it has changed, coupled with the fact that when I re-enter it, the connection establishes quickly.
I do not think that it is someone outside breaking into the network and changing stuff, as I live in a remote area and would notice them.
Thanks so far,
CJ