Hi everyone, I'm Nico, I'm italian and I have bought my new Surface PRO 3 quattro days ago (I love it so much, my version has i5/256gb/8gbRAM)) but i have discovered a strange thing: if I use the default PEN and TOUCH settings, my SP3 work very properly and the accuracy of the input (pen and touch) is very good. But, later an accurate PEN and TOUCH calibration, they begin to run approximately and, in some points of the screen, they do not allow to work with precision. Can you give me advice on how to solve? I also tried to re-initialize the system but have not solved! I am the only one who has noticed this? Your device, after calibration, will be problems and / or inaccuracies (pen and touch)? You can do some testing? So, actually I can return to the store it and replace it with a new one .... but do you think it's worth it? Many thanks in advance!!