Hello I have the same problem, did you buy a floor model by chance? I did and I think that is what shop mode is a display mode that automatically changes any user changes to some preset, so that people can make changes to the tv when viewing it at a store and then having those changes discarded after a few minutes....it may be something that is has to be changed in the service menu though I don't know how to access it on this tv. I am going back to the store where I bought the tv from to see if they can help me. Hit me up if you find a solution.