LG CX Power Failure Due to Active Timers or App Settings

Check for active background processes by reviewing the 'Auto Power Off' settings within the General menu. Verify if any installed applications are currently in an 'Autoplay' state or if a 'Sleep Timer' has been configured to override manual shutdown commands. If the TV shuts down briefly and then immediately turns back on, it suggests an automated software trigger is re-engaging the unit.

Sources