Pressing M4 on mouse causes game to tab out.

Title: Ongoing issue with Mouse 4 button Server: EUW, NA, PBE. Type of Bug: In Game. Details: When the M4 button on mouse is pressed, the game will tab itself out and bring you to your desktop. This happens at random but will happen typically two to three times per game depending on how often the button is used. I use M4 as my 'attack move' hotkey' and where it gets used frequently, the bug will typically occur more so than opposed to someone who may use the button as a ping key (unless your spamming your pings) This bug has been happening since a little after the release of the new Star Guardian series for me and have noticed it come up on occasion in the boards.
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