I need help with my league client freezing, going black (all in game) and either returning to game or showing my desktop. The only way to get around this at the moment is bringing up task manager and closing league through there however if I restart the client and rejoin my match the problem ensues once more! Any help would be appreciated and i'm also repairing the client right now and hopefully that could positively affect the game for me.

I am having the same problem, however just closing LoL does not fix the problem, I have to reboot completely. I am currently re installing the client now.