Hi webmasters, I decided to share this with you after giving it time to the problem and now confident of the situation, but confused on the "how".
I have a network of sites, there is one, my "ugly site" performing great with adsense for years. I tried many thing with it to increase income and nothing worked, I came back to the same clean and simple design and the income got back to normal, yes is the kind of site that doesn't get updates and still works well, we have discussed that kind of sites before.
My daily income on the whole network came down since the midde of june and seriusly down the whole july. Then things got kinda stable, stable how? I'm receiving good response from the rest of sites, but not from this "ugly duck". The only weird thing on it is I'm using the old adsense code (being an old site), I will check upon this anyway.
The traffic is the same, I've been checking for weird ads and only one campaign of rigntones was running, I blocked it. The site runs the same numbers, same content, same traffic, same usual ads, coherent to the sites content but getting 5, 10 clicks per day. I already removed GA code as it was getting the site slower somehow but still the income is down for days. What surprised me the most is the traffic is the same, nothing have changed. No weird messages, no errors, no *not found*, no messages from WMT, nothing... just a several drop in clicks.
I would only guess a change on traffic quality, perhaps the same amount of visits but different people, not interested on the ads...
irony
It would seem there are no ads running when I DO NOT check the site... only when my visitors get it
/irony
Just sharing.