There is, or was, a bug in Android that reset sound levels within the S7. To resolve: 1. Unpair your Bluetooth devices from the Galaxy S7. 2. Switch off Bluetooth and clear the Bluetooth cache. 3. Reboot the phone. 4. Restart Bluetooth and re-pair with your devices. If you use GPS navigation with audio prompts, it too can affect volume levels
Once highlighted, you may press the Power key to select it. Now highlight the option ‘Yes — delete all user data’ using the Volume Down key and press the Power button to select it. Wait
How to clear the system cache on the Galaxy S7: Turn the Galaxy S7 or Galaxy S7 Edge off Press and hold the Volume Up, Power and Home buttons at the same time until the Android logo shows up and the phone vibrates Then let go of the Power button and continue to hold the other buttons Use the volume buttons to scroll down to highlight Wipe Cache
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galaxy s7 bluetooth not working