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Sounds like a bad controller board. Board-level repair on a monitor controller board is quite difficult and bound to fail, for a number of reasons. You can look at the part number on the controller and try to locate a replacement online. Otherwise, the switch for the menu might be bad.
One of two things. Most likely one of the buttons on the Tv is bad causing eratic functions. Igf so you might be able to disconnect the whole button-board. Could be the maion board in which case it's time to shop for a new TV.
There are probably some failing components in the uPC control area, or with the keypad board on the TV sets front panel. It is also possible that there is a problem with the filtering of the distributed power through the circuit boards of the set, and there is some noise causing a false trigger of the function.
This type of fault can take some time for the tech to figure out, unless it is a published common fault with the particular model of set where they give a list of parts to change.