What’s going on with etology.com ???

I’m using etology.com for advertising on a adult site of mine. I usually have around 600 clicks with about 13US$ revenue per day.
I’ve not changed anything on the code, and my unique visitors as well as the pageviews are the same as every day, but yesterday I got only about 130 clicks counted with a revenue of 3.50 US$. How can this happen?
Anyone experienced the same or a similar problem with etology this days? Anyone knows about a (better) alternative?
Ciao
HM

Original post by torvalds