I have had adsense across 4 sites for 5 years now. During that time my revenue has increased steadily (thanks to the help from members at WW)

However, over the last 6 months my revenue has dropped off steadily and as of today it is down by 50% ... despite adding new content - culling ads from low performing pages - traffic up - placing ads above the fold - and still in the top 10 for 160 keywords across all major SE and unique traffic worldwide.

Causes? Sign of the time? I think not!

It seems to me every time the powers that be add new exotic revenue options such as: third party ads - interested based ads and lick more off the top of my ice-cream cone - I the publisher suffer until they get it right.

Looking at my bottom line today is a joke... I was doing better when things were simply a case of placing the most popular ad size above the fold of content filled pages without all the bells and whistles.

Now I discover that not all ads are not showing above the fold - only after a refresh. (end rant)

So my question is? What do I do about it?