Ive had my galaxy tab 8.9 since May this year and have constantly had this problem on and off. Ive tried resetting to factory defaults and have even sent it to samsung for repair who returned it saying they could find no fault!
My tab takes random screenshots and sometimes brings up the touchwiz menu and selects one of the app shortcuts like calendar, calculator etc. So frustrating...
Also, very rarely, without pressing it, the back key gets stuck and itll exit out of the current running app till i get to the home screen.
I thought this may have been a hardware issue as when i hold the tab in portrait, it would still click things down the same side (the side with the SAMSUNG logo) where the taskbar would be if the tab was held in landscape mode.
I dunno, maybe it is an app causing this, or touchwiz? I was hoping ICS might sort this out, but its not been rolled out in the UK yet...
Any suggestions would be muchos apreciados!