Is everyone else finding Yahoo mail impossible to use, or is it just me?

I mean, last couple of weeks I've had only a 50/50 chance that Yahoo Mail will actually present a page I can read whenever I log onto my mail - sometimes it flickers then I get an Error 999 message. This seems to be getting worse! Anyone else having the same problems or have I got a new type of virus? Strange that it's only Yahoo, my other emails accounts are fine. I would complain to Yahoo, but I can't use their complaints system either as that is down too. Seems like they have a big problem, but I wonder what they're doing about it as it's been weeks now, plenty of time to address the problem.