Google adsense at times infuriates me. The thing is that they control how much they are going to dish out to you. I have started researching on how to build membership sites to get solid recurring income
Adsense works exactly that way. Some days you make a lot, others you make cents just like a real store!
The Google AdSense income was never stable. If you know how AdWords and Internet works you will know the reason.
I've had some days where i earn literally nothing with a good amount of traffic, and some days where I have almost no traffic, but all the traffic happened to click an ad. It's weird, and I agree, can be frustrating.