Here's various things to read and try:
- Reset your AirPods - https://support.apple.com/HT209463 - "You might need to reset your AirPods ... to fix a different issue. These steps work with the Wireless Charging Case and the standard Lightning Charging Case."
- AirPods Service and Repair
Learn more about AirPods service options, warranty, and pricing. - https://support.apple.com/airpods/repair/service
Contact Apple for support and service --> "See a list of Apple phone numbers around the world."
Click here --> https://support.apple.com/HT201232