My LG LED TV has basically had this issue since I bought it. At random times while I’m using it, all of the lights on the touch-sensitive buttons in the corner will light up (not normal) and the TV will begin beeping wildly. With every beep, different menus and functions pop up on the screen. It frequently will turn the TV speaker volume all the way up to 100; it’s a good thing I usually have my receiver plugged in instead. During these “freak-outs,” it won’t permit me to turn off the TV, either by remote or physically pressing the button. It also won’t usually allow me to make any adjustments with the remote, including lowering the volume.
I ended up buying the 4-year extended warranty through Best Buy, so I’m hoping I’ll be able to send it in once I have the time.
Model is 47LE5400.