Hi, my S7S touch screen suddenly not working properly, its look like it is not corretly sensing the correct position on the screen. Also, if I tap the screen once (one finger), the system tools will pop out, and if I tap the screen with two fingers, the keyboard will pop out. Also, using the touch logon, it is either not working (may be due to sensing the wrong location) or I have to press hard on the screen to get it working. I have restart the S7S manay times, or even tried to roll back to the previous update point but the problem still pesist. Can anyone give me some advice? is there anything I can do? for example, re-calibrate the touch screen? Thanks So now it is clear, it is the 3rd party charger that cause the problem. http://www.amazon.com/Replacement-A...NXBC/ref=sr_1_6?ie=UTF8&qid=1324361209&sr=8-6 Evening updat: everythings back to normal when return home, nothing has been done on the S7S, and it was in sleep mode! P.S. the pen and the mouse work OK Latest update: If problem persist, try download the S7S Display Driver from Samsung Web Site and Reinstall the display diver, may be it was the windows update that caused the S7S switch to another intel display driver!?