Nexus Blitz Kicking me out

Something kicks everyone out in nexus blitz. I think its when the first game mode is starting or starts then we all get kicked and put back into the home screen. Two times it happened first time it was about 5 secs into the first game mode the second time it happened when the first game mode started. We all had different champs in our games so it wasn't a specific champion that was doing it.
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