No that is not the case. I think google adsense is undergoing some kind of upgradation work. There is a similar post here which says the same. And this is happening to everybody.
hmmm There is a constant problem happening with Adsense for the past 4-5 days. Resulting in less earnings as they mentioned in their blog, they had a 10 hour problem with showing relevant ads which caused us low earnings, since then the trend is continuing to go down. I'm hoping they will resolve this issue sooner which is affecting all of us.
Where those traffic from? It is impossible to me. I get about 5% CTR normally, the proble i'm facing is hard to improve my traffic now