Peculiar ranked loss

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My latest ranked game I was playing wukong, the game went pretty smooth, we had just pushed the inhibitor and started killing the nexus off a won team fight. we got it to about 1/4th life and without any warning, the screen whisked to our nexus and showed it blowing up in defeat, like a surrender, however no one on my team initiated a surrender vote there had been no vote, there was just a quick loss animation. I lost LP for it and am kinda baffled as to what happened. Has anyone else had a similar problem?