My Surface (1) is intermittently detecting finger touches along the right hand side of the screen. Some times it displays the translucent circle around about where the Start button would be in the charms bar as if my finger is there, and other times it'll completely go haywire and detect swipes going up & down the same side of the screen. Other times it works just fine. Has anyone else run into this issue? I bought my Surface on release day last year so unfortunately its out of its warranty period.