I agree netmeg, something is definitely wrong. Unfortunately, I have no idea what it is.
I would look at origins of traffic, and your placements.
If you are satisfied that your traffic is okay, then look at your placements. Make sure each one has its own custom channel, and see if there are any patterns to the take-backs - if you find it's usually one ad unit, maybe you need to make some changes there; make it more or less blended, or move it over a few pixels. But having that much lopped off every day is a signal something is really wrong.
I doubt I'll be able to post here soon since whatever Google has denied it is rolling out has ripped three of my sites apart in the last few days.
Traffic levels are now at 20% of just two years ago and it's been made worse this year firstly by the new image search and then by all the utter fictitious garbage I see when checking their SERPs ... No wonder I use Bing to get answers.
Today earnings are running about 3x yesterday (which is to say still lousy). Yesterday never got off the ground and might explain why today seems above average. Here's to hoping there's more still to come.
Today: UP compared to the new low days of the present but low compared to the usual daily earnings checked an hour ago but right now can't see the reports it stays on trying to load the page... nothing, blank
I'm beginning to think something major changed at Google starting on May 1, and not just for sites running AdSense. I say this because one of the sites I manage is an established brand that has had very stable traffic levels since 2007. On May 1, there was a significant drop and it has stayed there. Whatever is going on, it seems to be on Google's end.
Trying to understand what's going on with AdSense is a pointless task right now. My UK earnings almost beat the USA Sunday with a CTR I haven't seen since the early days, even my CMS gallery had a good earning's day even though Page Views were at 50%.
Overall I ended up with my second best day of May and 8th best of 2013 ... Did someone mention Mother's Day?
Yesterday's earnings still there, yay. Whatever was going on with clicks being zeroed out over the course of the day earlier this month seems to have subsided somewhat. I'm still averaging only 1/4 of the daily click count I was getting in April, but the CPC is double, so earnings are about the same. Hope the upward earnings trend continues!
I/m tired of certified ad networks taking up 30% of my ad space, with little to no clicks. And when clicked, the CPC is a joke! When G says they're bidding for ad space that may increase revenue, they don't mean on my sites. BLOCKED
Back on subject, garbage yesterday, today...who knows.