Yes sometimes there are going to be games where you will win easy weather you play good/bad, and equally there will be times where no matter what you do you continue to lose, these can last 5/10/20 often 100+ games, it's just variance and there is nothing you can do about it except putting in enough volume to make the effect of variance negligable.The problem with putting in volume to come out of a bad streak is that your game is effected by tilt which causes us to play worse and sometimes become a losing player (not trying to be patronizing, just building the picture :P) . The perfect poker player wouldn't be effected by tilt but for some reason, sooner or later, it will effect all of us.Most professional Pokerplayers have got to the point where they do not tilt at all from the variance experianced from <100games especially less than 10 game bad streaks which is all you've experianced thus far. As you play thousands of games and see many, many of these up and down streaks and you learn to ignore them and focus on the long run. You shouldn't instantly expect this of yourself but you should strive for this since it will allow you to grow and develop as a poker player much faster and make you more $$$.anyways gl and by the look of your graph your not even running bad/breakeven, and to actually answer your question i'd say it's just being unlucky/variance though this isn't somthing you can tell from a graph, it's just somthing you should know and learn to notice   

I totally agree with chugenemes.Probably it's normal varience. Just put enough volume. But be aware: Sometimes we're playing bad and we start blaming variance... To avoid this constantly review your games, watch videos and post hands. And one of the most important thing in my opinion:Avoid playing when you are tired and learn when to stop.GL!