Lately I've noticed a little command window popping up, running something, and then closing... but it's enough of a disruption to take focus off the game, make you stop walking/firing in TF2 and in Warcraft. Wife noticed it, too, we're both running Windows 10. I'm posting the solution in case someone else is having an issue. I subscribe to Microsoft Office 365 and Microsoft pushed an update that broke one of the schedule tasks (shocking). This is already fixed and ready for an upcoming update, but I don't know if it'll be pushed on 6/13 or if they'll wait until the second Tuesday of July. If you are experiencing this, and want to fix it now, these are the steps: Search for "Task Scheduler" Open it Navigate to Task Scheduler Library -> Microsoft -> Office Find the task "OfficeBackgroundTaskHandlerRegistration" Edit it (double-click it) On the front page, click the button "Change User or Group" Type "system" (without quotes) Hit OK Hit OK Close the Task Scheduler You won't see it again. Hope this helps someone else!