Client Blackscreen

Just within the last few days, every few lobbys that get dodged either myself or a member of my team practicing for clash will come out of champ select and instead of being returned to queue the client with the exception of the friends list goes black and the only way to get out of it is to restart the client. As far as replication it seems to just be happenstance when someone dodges champ select, perhaps its more common in a premade of 2-3 or more, im not sure.