Randomly tabbed into windows

This error have been present for quite some time now. You sit there casually playing the game, some times it happens before cs spawn, and at times it happens while laning.., then out of no where you get tabbed out of the game into windows. Does anyone have any idea why this happens, or is there a work-around to stop it from happening?

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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