Tabbing out of game without tabbing?

I keep randomly tabbing out of game, and there seems to be no reason. I tried to sit in a practice match to see if it was just me tabbing out, but it is just tabbing me out of game without my input. I looked some stuff up to try and figure out what could be causing it, but the only thing I found says that it was a scheduled task with windows office that likes to recreate itself every hour, but this happens at completely random intervals and only started since I got my new drawing tablet hooked up. I think that unplugging my tablet might temporarily fix it, but i'd like to keep it attached. It also randomly happens in other programs and games, even google chrome.

Any help is appreciated, thanks!

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