I'm going to continue to update here as I work to try to unravel this. It's become personal. I MUST know what the heck is happening! :)
Well, one of our busiest and most important sites lost 20% of page views yesterday, and then another 20% today (hard to tell since day is not done).
Every day brings a bouquet of disaster, and oh, i backed into a ditch today and had to be towed out. THat one I can't blame on Google, but I'm working on it.
Nomis, I KNOW it doesn't make sense. I'm looking under every pebble to try to figure out whats going on.
However, volume of traffic is less important than WHY they found you, and what they are looking for. Again, if I'm only getting visitors from places people don't buy from, or click from, it would explain things.
But there's other possibilities, like weird server behavior (except we use two different hosts, and drops are on sites hosted on both), some weird coding errors that I made across all the sites.
There is some strange errors showing in the google adsense diagnosis area that I'm trying to figure out.
One good thing. It's forcing me to look very carefully at my sites and the result will be better pages. I'll be bankrupt but I'll have great pages.