LoL uninstalls itself while playing

It just happened to me for the second time in the last 2 weeks. Every time when I was in game I lost connection and couldn't reconnect any more. When I wanted to re-open the game I got the message that the game was no longer installed on my pc. Did anyone else had this issue? What can I do to prevent it from happening next time?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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