Why does this happen 5 times in a row?

5 loss streak, insane bad luck. I play in the botlane, either as vel'koz support pummeling them with poke, or as scaling adc. Not a whole lot of room to crush them in the early game unless I'm scripting and hitting every single ability as vel'koz. Meanwhile all other lanes lose and our jungle loses. Only one of the last 5 games I felt like I had a good team but guess what, our jungler disconnects extremely early on. We even almost won that game still, just so bizarelly unlucky. How to break such an epic bad luck streak any advice?
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