the sound on my v-series cuts out randomly for a second, especially on streaming apps

Diagnosis

The intermittent audio dropouts on the Vizio V505-J09 are typically caused by a "handshake" failure between the TV's internal audio processor and the content delivery stream. This happens most frequently in streaming apps (Netflix, Hulu, Disney+) because these platforms often switch dynamically between Stereo, Dolby Digital, and Dolby Digital Plus depending on the scene or the available bandwidth. When the TV attempts to switch the audio codec on the fly, there is a momentary lapse in processing, resulting in a 1-2 second silence. You can confirm this is a software/processing issue if the audio drops occur specifically during transitions—such as when a show moves from a quiet dialogue scene to a loud action sequence or when an advertisement starts. If you are using an external soundbar via HDMI ARC/eARC, the issue is compounded by HDMI-CEC (Consumer Electronics Control) polling, where the TV and soundbar repeatedly negotiate the audio format, causing the "cut out" effect. This is not a hardware failure of the speakers, but a synchronization error in the digital signal path.

How to Fix It

To resolve this, you must disable the TV's attempt to automatically negotiate the audio format and force it into a consistent, linear stream. Follow these exact steps:

1. Press the Menu button on your Vizio remote to open the main system settings.
2. Navigate to Audio and select it.
3. Scroll down to Digital Audio Out. By default, this is set to 'Auto'.
4. Change this setting to PCM (Pulse Code Modulation). This converts the audio to an uncompressed digital format that does not require the TV to "switch" codecs, eliminating the dropouts.
5. While still in the Audio menu, locate Audio Mode and set it to Standard. Avoid using 'Dynamic' or 'Movie' modes during troubleshooting, as these apply additional DSP (Digital Signal Processing) that can trigger lags.
6. Exit the menu and restart the streaming app to clear the cache and apply the new audio handshake.

If That Didn't Work

• Disable HDMI-CEC: If you are using an external soundbar, go to Menu > System > CEC and toggle CEC to Off. This prevents the TV and soundbar from constantly "talking" to each other, which often resolves the timing gaps that cause audio drops.
• Perform a Soft Factory Reset: Navigate to Menu > System > Reset & Accounts and select Reset TV. This clears corrupted system cache files that may be interfering with the V-Series audio driver. Note that this will remove your logged-in streaming accounts.
• Update Firmware via USB: If the TV's internal Wi-Fi is unstable, the automatic update may have failed partially. Check your current version in System > System Information. If it is outdated, manually download the latest firmware from Vizio's support site onto a FAT32 formatted USB drive, plug it into the rear port, and trigger the update manually.
• Test Optical Connection: If you are using HDMI ARC, switch to a Digital Optical Cable (Toslink). Optical cables do not support CEC handshaking, which completely bypasses the HDMI protocol errors causing the dropouts.

Heads Up

• Avoid Power Strips with Voltage Sag: V-Series TVs are sensitive to power fluctuations. If your TV is plugged into an old, overloaded power strip, it can cause the internal audio amp to trip momentarily. Use a high-quality surge protector.
• Avoid "Eco Mode": In some firmware versions, the Energy Saving/Eco mode can aggressively throttle the processor, which may lead to audio lag or dropouts in high-bitrate 4K streams. Keep this set to 'Off' or 'Low'.
• Cable Quality: If using an external device, ensure you are using a High-Speed HDMI cable (Category 2). Older cables cannot handle the bandwidth of 4K HDR and Dolby Atmos, leading to signal drops.