"Admin needs to provide us with answers about why sites are failing as in "dropping like flies". "
If we knew the answer we'd certainly let you know. It appears to be just a cyclical event. It's possible the checker was started discovering sites that should have been failing all along, or that many people are switching providers, revamping sites, etc. and forgetting to move the code when they do.
We'll make an effort to query some of those "leaving" the system to ascertain the reason(s) why.
Ann, many of the sites should have failed long time ago, I had two myself go down recently, but while things were being held up, it is best to leave things alone. I think the yahoo days should be gone for ever, and only websites with active registration should be kept. There are at least another two of these old types on my sites, which will have to go shortly, which I will do.