Google Shows Unpredictable Behaviour

I don’t know whether my belief that lately Google shows unpredictable behaviour is correct or not. But as in my experience, within this month, I have twice lost pagerank, but also twice it’s back again. While in another blogs of mine, this behaviour is also coming in series. Like today, as you all can see, my pagerank is gone. I don’t know it will be permanent or not but I hope, it’s just temporary accident. Since I often facing this kind of problem, that’s why I write here. Hopefully, if there’s one of you who may experience the same thing, you can share your tips and trick on how to avoid it. Anyway, sorry for this simple post, I have no enough time at this moment.