I have the following problem: I set my picture size to 4:3 and the picture style to movie; after exactly 30 minutes every time the picture size comes back to 16:9 and the picture style to dynamic... What can be wrong? How can I avoid this?
I wouldn't do a factory reset. But the Demo mode is on and that's what is causing the problem. There should be instructions for getting your tv out of demo mode by pushing a few buttons on the tv, in the owner's manual or online at www.Samsung.com and click on support at the top of the page.
Factory reset may do things to the tv you don't want reset, the demo mode is easy to turn off so keep it simple.