Same problem here, I posted about it in my own thread
and then found this thread.
What gives? I did not notice this problem for the first few days but I am definitely noticing it now. I has happened twice now in the last 12 hours or so. Battery pull fixes it.
Not very happy now. Software glitch would be okay, hardware is what I am worried about. Running the latest OS 9800, 188.8.131.525/184.108.40.206 (Multilanguage) on Bell Mobility network. Phone is two weeks old only and I barely used the touchscreen to date.
Edit: I just tried the settings from this thread
and will wait and see whether this problem comes up again. I am not sure what the heck is going on but it is annoying as hell and makes me very worried about hardware being defective as much as I try to believe that this is a software defect.