The User Profile Service failed the logon

Hi

Over the last few weeks I have had literally 100's of my customers reporting this problem

The usual "The User Profile Service failed the logon" message comes up when they try to login

I have been fixing each time by changing the profilelist registry entries as perhttp://support.microsoft.com/kb/947215

But it keeps happening, some customers are then okay for a week or two and it then happens again

Has anyone else been seeing a lot of this issue? and if so any ideas what is causing it

All the computers have been checked for viruses and have valid security software loaded, so don't think virus related, but is getting annoying now and rightly so some of my customers are getting fed up having to pay to get it fixed each time

Any ideas?

Darren Rose