Why???

I get in the loading screen for a match, my game freezes. I can't exit out of the client. It fucks up my computer to the point where I have to restart it. I get back to the client, it says "Sorry! We've detected a problem with your installation. We will now attempt to repair the affected files." What fucking installation is there a problem with? The patch was installed like 4 hours ago. Anyways, I also lost LP because of that stupid fucking freeze that wasn't even my fault. Similar things were happening before they "repaired" ranked, because I had a remake before that. And I saw a ton of people on the boards complaining about it. If I don't get my LP back I'm going to be pissed off (more than I already am). And now I can't play a match because it has to "repair my installation". I'm confused how a game with this many players still has stupid ass things like this happening.