Got a brand new 13' MBP and love it. Great device, perfect screen. But noticed yesterday that when I hit the 1 key repeatedly it sometimes seems to click twice during release. It works fine and it doesn't do it all the time. Maybe 1 or 2 out of 20. Is this something within specs or a defect? I am afraid to enter the return game with an otherwise perfectly functioning system. Grateful for your expertise.