Why Sony WH-CH520 Keeps Disconnecting? (8 Fast Fixes)

Why Does My Sony Headphones Keep Disconnecting WH CH520? The Quick Answer

Your Sony WH-CH520 headphones keep disconnecting primarily due to Bluetooth signal interference, outdated firmware, or a glitch in the Multipoint Connection feature. Most users can resolve this by disabling the “Connect to 2 devices simultaneously” setting in the Sony Headphones Connect app or by performing a factory reset to clear the pairing cache.

Key Takeaways: Fixing WH-CH520 Connection Drops

If you are in a rush, here are the most effective solutions gathered from expert testing and user feedback:

• Turn off Multipoint Connection: This feature often causes “ping-pong” disconnecting when two devices compete for the audio stream.
• Prioritize Stable Connection: Change the Bluetooth connection mode from “Priority on Sound Quality” to “Priority on Stable Connection” in the Sony app.
• Clear Interference: Move away from 2.4GHz routers, microwaves, or crowded Wi-Fi environments.
• Update Firmware: Ensure your Sony WH-CH520 is running the latest version via the Headphones Connect app (Version 2.0.0 or higher is critical).
• Reset the Bluetooth Stack: Forget the device on your smartphone/PC and re-pair from scratch.

Understanding the Bluetooth Architecture of the Sony WH-CH520

The Sony WH-CH520 uses Bluetooth 5.2, which is designed for efficiency and low latency. However, even with modern hardware, wireless signals are prone to environmental and software-based disruptions.

When you ask why does my sony headphones keep disconnecting wh ch520, you must consider that these headphones support SBC and AAC codecs. If your source device struggles to maintain the bitrate for AAC, the connection may drop.

Furthermore, the DSEE (Digital Sound Enhancement Engine) processing requires extra CPU power from the headphones. In rare cases, high-processing loads combined with a low battery can cause the internal Bluetooth chip to restart.

Step 1: Troubleshooting Multipoint Connection Conflicts

The Multipoint Connection feature is one of the most common reasons users experience drops. While convenient, it allows two devices to stay connected, often leading to a “handover” glitch.

1. Open the Sony | Headphones Connect app.
2. Go to the System tab.
3. Find the toggle for “Connect to 2 devices simultaneously”.
4. Switch it OFF and test the headphones with a single device.

Expert Insight: I have found that if one of the two connected devices is a Windows PC, the PC often “hijacks” the Bluetooth channel for system sounds, causing the headphones to disconnect from your phone.

Step 2: Optimizing the Sony Headphones Connect App Settings

Sony provides a dedicated app to manage the WH-CH520. Incorrect settings here can lead to frequent drops.

Change Connection Mode

By default, the headphones might try to prioritize audio fidelity. This is great for sound but bad for stability in crowded areas.

• In the app, navigate to the Sound tab.


• Scroll down to Bluetooth Connection Quality.


• Select Priority on Stable Connection. This forces the use of the SBC codec, which is significantly more resilient to interference than AAC.

Disable Voice Assistant Trigger

Sometimes, the “Google Assistant” or “Amazon Alexa” integration misinterprets ambient noise as a command, causing the audio to “duck” or the connection to reset. Try disabling the Voice Assistant feature within the app settings to see if stability improves.

Step 3: Resolving Environmental Interference

Since the Sony WH-CH520 operates on the 2.4GHz frequency, it competes with almost every other wireless device in your home.

Step 4: Step-by-Step Guide to Resetting and Initializing

If software toggles don’t work, you need to “cleanse” the hardware memory of your Sony WH-CH520. There are two levels to this: a Soft Reset and a Factory Initialization.

How to Reset (Soft Reset)

This does not delete your pairing data but restarts the internal software.

1. Connect the headphones to an AC outlet using the USB Type-C cable.


2. The charging indicator should light up.


3. Press the Power button and the Volume – button simultaneously.


4. The device will reset.

How to Initialize (Factory Reset)

Warning: This will delete all pairing information. You will need to pair with your phone and laptop again.

1. Disconnect the USB Type-C cable and turn off the headphones.


2. Press and hold the Power button and the Volume – button for about 7 seconds.


3. The indicator light (blue) will flash 4 times.


4. Your Sony WH-CH520 is now back to factory settings.

Step 5: Updating Firmware for Improved Stability

Sony frequently releases “Stability Improvements” via firmware updates. If you are asking why does my sony headphones keep disconnecting wh ch520, you might be running an outdated version that hasn’t patched known Bluetooth stack bugs.

1. Ensure your headphones are charged to at least 50%.
2. Connect them to your smartphone.
3. Launch the Sony | Headphones Connect app.
4. A prompt will appear if an update is available.
5. Do not turn off the headphones or the phone during the transfer.

Common Connection Scenarios and Solutions

Disconnecting specifically on Windows 10/11

Windows has a feature called “Bluetooth Power Management” that turns off the Bluetooth radio to save power.

• Right-click the Start button and select Device Manager.


• Expand Bluetooth.


• Right-click your Bluetooth Adapter (e.g., Intel Wireless Bluetooth) and select Properties.


• Under the Power Management tab, uncheck “Allow the computer to turn off this device to save power”.

Disconnecting while walking or at the gym

This is usually physical interference or “body blocking.” Bluetooth signals struggle to pass through human water mass.

• Fix: Try moving your phone to the same side of your body as the Bluetooth receiver in the headphones (usually the right side on the WH-CH520).

Why Does My Sony Headphones Keep Disconnecting WH CH520? (Advanced Hardware Check)

If none of the above steps work, there may be a hardware defect. Based on industry failure rates, approximately 1-2% of consumer Bluetooth headsets suffer from a faulty internal antenna.

• Check for Physical Damage: Inspect the earcups for any cracks that might have let moisture reach the PCB.
• Battery Health: If the disconnects happen only when the battery is below 20%, the battery may no longer be able to provide the voltage required to maintain a strong radio signal.
• Warranty Status: Sony typically offers a 1-year limited warranty. If your WH-CH520 is new and keeps dropping connection after an initialization, it is likely a hardware lemon.

Frequently Asked Questions (FAQs)

Does the Sony WH-CH520 support LDAC?

No, the Sony WH-CH520 supports SBC and AAC only. It does not support the high-bitrate LDAC codec. If you are trying to force LDAC via Android Developer Options, it will cause the headphones to disconnect or produce no sound.

How do I stop my WH-CH520 from turning off automatically?

The headphones have an “Automatic Power Off” feature. If they don’t detect a signal or aren’t worn (depending on the sensor settings), they shut down. You can adjust the “Automatic Power Off” timer in the Sony Headphones Connect app under the System tab.

Why is the sound cutting out in only one ear?

This is usually not a Bluetooth disconnection issue but rather a ribbon cable problem inside the hinge or a temporary buffer underrun. Try resetting the headphones. If it persists across different devices, it is a hardware fault.

Can a low battery cause Bluetooth drops?

Yes. As the voltage drops, the Bluetooth 5.2 chip may struggle to maintain the handshake with the source device. Always keep your Sony WH-CH520 above 10% charge for a stable experience.

Is the WH-CH520 compatible with Bluetooth 4.0 devices?

Yes, it is backward compatible. However, using the Sony WH-CH520 with an older Bluetooth 4.0 or 4.1 transmitter (like an old laptop) will result in much lower range and more frequent disconnections compared to a Bluetooth 5.0+ device.