try this: goto Settings>phone infoTap on build number multiple times to enable developer options.one enabled, gotosettings>developer options>Bluetooth codec> select SBC or Scalable, try which works better
Galaxy buds have infra-red based proximity sensor to detect if they're in your ears. if you remove both of them while in a call, the sound will switch back to earpiece of the phone. this is the designed feature and quite helpful, but in your case may...