Diagnosis
The auto-standby feature is activating. It triggers after approximately 15-20 minutes of no audio signal detected.
How to Fix It
Disable auto-standby. Press and hold the MOVIE button on the remote for more than 5 seconds until the display shows 'A.STBY OFF'. The soundbar will now stay on until you manually power it off.
If That Didn't Work
If it's still powering down, the issue is likely a lost audio signal from your TV. Check your TV's audio output settings to ensure it's continuously sending a signal (e.g., set audio output to 'PCM' instead of 'Auto' or 'Bitstream' for stability).
Heads Up
With auto-standby off, remember to turn the soundbar off when not in use. It draws about 5W in idle, which adds up over time. The power indicator will remain amber instead of white when it's in standby.