Due to drop in CTR or EPC?

Over what period of time? The past week, the past month, or what? Compared to what previous period?

Any related traffic changes?

CTR, EPC and Traffic are all reporting about 1/2 normal.. This occurred today and is compared to almost any day in the previous 6 month period.

Really strange.

Why not wait until the end of the day to draw any conclusions? Even Google doesn't claim that its reports are in real time.

I agree with s_j. Yesterday at 11 PM my stats looked pretty bad. Today when I check them they ended up just fine.

I see that all the time in this month ...

Stats do seem to wobble from time to time. However, as other posters have noted, they tend to even out when you look at a longer horizon. It appears that some earnings sometimes end up creditied to the next day or so.

One thing that helps sort things out is to put your daily earnings into an excell spreadsheet. Graph that and then do a trendline. for the trendline, select moving average and set that to about a week or a month.

If the moving average starts to take a steady dip, then you are having a long term problem.