I've had this issue for quite some time now. I've tried draining the battery completely and charging them again, resetting the buds, etc. They won’t charge, pair, make the pairing(sensor) noise when it’s picked up from the charging case. There is a red "!" on top of the right bud as well. How can I solve this issue?
I would recommend unpairing and repairing your buds from the Wearables app and Bluetooth menu after clearing the cache and data from the Wearables App. You can do this by navigating to Settings>Apps>Wearables App>(Force Stop the app)>Storage, from here you can clear the cache and data.
If you are still experiencing this symptom after performing this, I would recommend getting your device evaluated by a technician to diagnose and repair your symptom. I would be happy to look into service options for you. Could you please provide me with the model and serial number for your Galaxy buds in a private message to do so? https://bit.ly/2SUXRar