I've been having lots of problems with Yahoo Merchant Solutions. After doing a quick search through some old threads, it seems like I'm the only one. Has anyone else had problems with Yahoo?

For example, every since late last night, no one is able to access the shopping cart. 1/2 a day later, it's still not fixed and today is a huuuuge shopping day. I'm just missing out on all those sales and there's nothing I can do about it. And, this isn't the first time. Over the last 4 months, our site has been unable to take orders over a half dozen times -- all errors on Yahoo's end. They seem to have a lot of problems ("error 400" seems to be popular one!).

Is it normal to have so many problems with a storefront? Is it just Yahoo or is there something else better? Any comments would be appreciated!