I got back from holidays yesterday and found that the VoIP (telephone) part of my router had died while I was away.
It may have been a lightning surge up the telephone line? Not sure.
The performance of the forum seems to be affected also.
I ordered a new router last night so it should be here on Monday.
I'll have it up and running on Monday night.
Thanks for your patience until this issue is resolved.
On the bright side, the forum has been very reliable over the last year.