Power management is turning off the USB port. Fix:
: Go to Settings > System > Sound and ensure the JieLi device is selected as your default Input or Output device. jieli br21 driver link
For developers looking for SDKs or programming resources, the official Jieli Technology GitHub Power management is turning off the USB port
I can confirm this works with Ubuntu 22.04. Using at terminal lsusb lists as: "ID 4c4a:4155 Jieli Technology USB Composite Device" Ask Ubuntu Jieli BR21 Bluetooth dongle shown as storage device jieli br21 driver link