I'm sorry to hear that you're having this issue.
Try to go through the Plug and Play setup again, and select your default language. Make sure that you're choosing the equivalent of "Home Mode" rather than "Shop Mode" in the PnP setup.
I have a samsung LCD don't have the model number on me. New tv.
I have to reset the Audio Language using the tools button to English every time i change channel while watching DTV.
It defaults the audio language to "2ad.premix" which results in no sound. Hense i reset it to English and i have sound but it wont store it. All defaults under language are set to English and the Preference languages are set to English.
I'm in Ireland.