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Hello, This is a fault with the mainboard of the set. This board processes the remote commands and also generates the turn on/off control in the set.
The only thing you can try on a user level is leaving the TV unplugged for several hours or more (overnight is best), to see if the EEPROM (processor) resets. I don't have high hopes for this though.
If the issue persists beyond that then the Mainboard in the set needs to be replaced. If you're a DIY type then the mainboard can be purchased at the link below for your set:
Alternatively if this is not something you're comfortable with, the a shop will generally charge $300 parts and labor for this repair and can be located at the following link:
Other than that, sorry for the bad news on this one.
If you need further assistance let me know. Please do not forget to click the 5 STAR RATING, at the top of the page for my efforts. It is my livelihood and you can follow up at any time if needed.
The buttons on the side and the remote are both processed through the Mainboard- it processes all of these commands. So it does not matter if it shuts off with the volume controls on the TV, the original remote, or a universal remote- this still indicates the Mainboard needs to be replaced.
The Mainboard is getting a command for volume- but instead shutting itself off which indicates a faulty EEPROM (processor in the set). The answer above outlines what needs to be done to fix this. Sorry for the bad news on this one.
The EEPROM fails- its the processor as stated above in my answer.
Do you need further assistance with this?