StarCraft II Corrupting Itself

About once every two weeks (regardless of how much I’ve played) StarCraft II will crash at some point before it gets to the login screen. Until this is corrected, I cannot play StarCraft II (it crashes at the same point every time). About 10% of the time, the Repair tool fixes it. Sometimes deleting all the settings fixes it. Most of the time, I have to reinstall the whole application to get it working again.