This happened a few weeks ago (17th August, according to a thread on the Help Forum). It was only like that for a day or two last time, and It is noticeably deteriorating now like last time.

My guess is the server is running out of memory or some resource and that with a reboot it will run happily for another few weeks.

I'd say Jon is spot on with that guess. It would be my guess too.

As some have said, we really are spoilt these days - this is nothing compared to the trouble we used to have!

Jenny (off to potter in the garden)