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TV starts and shows a clear picture then turns off

I have a 65 inch LG OLED C7 tv which is about 5 years old(see model details in picture below). A couple of days back it started turning off after about 20 to 30 seconds. When it comes on it displays a proper picture. This happens with both Sky and Netflix. I tried disconnecting all connections, removed and reconnected the power cord and the issue still persists. The TV also does not stay on long enough for me to reach the onscreen setting and perform a factory reset.