Ensure if all functions of faulty ear buds are working or not
1. Put the ear buds back into the charging case and then use it again
2. Use ear buds in mono mode and check if still each ear buds have no sound.
If issue still persist, than follow reset process.
1- Remove device name from Bluetooth Interface
2- Take out the earbuds from the charging case.
3- Tap on both the earbuds 5 times.
4- Place both the earbuds inside the charging case and repeat the pairing process.