ok, let me explain my issue a bit more elaborately by taking an example of usage of my phone during a normal day. I wake up, check the phone for any calls, messages or emails. Read a few articles etc. When the screen is off, i turn the screen on, i try to unlock the screen but the touch does not work. I press the power key twice, the touch starts working normally. During the course of day, similar issue occurs. There is no consistency in any particular processing running on the phone, or any particular color showing on the screen. Its just that when I turn on the screen, the touch issue starts. It can be as minor as a few additional ghost / missed touches (in this case i can confirm the issue using YAMTT app) or it can be as bad as totally non responding touchscreen (in this case I cant even unlock the phone). After I press the power key repeatedly a few times (turning the screen on and off repeatedly), the phone starts working perfectly. But the issue can start again at any time...
I hope this wall of text clarifies the issue a bit. I am really annoyed with this problem since there arent many people reporting it and that its not an "always on" problem that I can show to the samsung guys. I am sure if I go to them and even if the phone exhibits this problem, they will just restart it and most prolly the problem will go away (as stated above) and give it back to me saying the problem is solved...