Diagnosis
This is a common audio dropout issue on the Hisense U8K, typically caused by a communication error between the TV and connected devices over the HDMI cable. It's not a fault with the TV's internal speakers. The problem stems from an unstable HDMI-CEC (Consumer Electronics Control) or eARC (Enhanced Audio Return Channel) handshake, which can interrupt the audio stream. This happens on all apps because the audio output is being managed by this same system-wide HDMI interface, even for internal content.
How to Fix It
First, isolate the issue by disabling the advanced HDMI audio controls.
- Press the Settings button on your remote.
- Navigate to Settings > Display & Sound > Sound.
- Find and turn OFF the 'eARC Mode' setting.
- Then, go back one menu to 'Advanced Settings' and turn OFF 'HDMI-CEC'.
- Fully power cycle the TV by unplugging it from the wall for 60 seconds, then plugging it back in.
If That Didn't Work
The TV may be sending an audio format that causes brief decoding failures. Force it to output a basic, universally compatible format.
- Go back to Settings > Display & Sound > Sound > Advanced Settings.
- Locate the 'Digital Audio Out' option.
- Change it from 'Auto' or 'Dolby Digital' to 'PCM'. This sends a simpler, uncompressed stereo signal that is far less prone to handshake errors.
Heads Up
If you are using a soundbar or AV receiver, the simplest permanent fix is to bypass HDMI audio entirely. Use an optical audio cable (Toslink) from the TV's optical out to your sound system, which provides a stable, high-quality connection without any handshake protocols. Also, check for and install any firmware updates for your external audio device.