It looks like an automated Google Penalty for something on your site and then your traffic jumps again after it expires and then whatever is causing the penalty is noticed again.
@hardali Nope, and I don't think any answer about anything I did lately would explain this as it's been going on for over a year - if you look at the dates!
It could be when google checking if your server could be online if it sends more traffic. I already have experience with it: http://i52.tinypic.com/2q1a1x0.png
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