Help me, cannot play game after 27 minute mark :(

Since the last patch, I have noticed that once the game timer hits 27 minute mark, my game freezes/crashes without **bugsplat**. It will freeze forever until I restart my computer, but the same thing happens once I go in game to reconnect again. Essentially, my team ends up losing because I am unable to play after the 27 minute mark due to some unknown error. I have already attempted to use hextech repair tool to repatch and nothing has changed. Please help ! :(
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