I've had my Scroll for about a week and am pleased with it except for the accuracy of the screen. Particularly around the edges I often find I have to tap away from the target to get the desired response, this often results in the wrong response or no response at all. The centre of the screen is spot on. I have calibrated the screen several times, this has made no difference at all. Is this a fault or am I missing something? This is spoiling an otherwise great piece of kit.