The upper left portion on my screen barely works when using pen and sometimes not at all when trying to using my finger. On the desktop if I try and drag an icon, with my finger, from the right side to the Recycle Bin, it seems to hit an invisible barrier. The pen is able to do it 99.9% no issue. I tried calibrating it but no help. Is there anything else I could try? I really don't want to return another SP3 to best buy, this would be my third one and I am just about to give up on owning one. I love this device but between getting defective units and all the bugs I don't know if its worth it. I have heard people talking about the SP4 coming out December...