It sounds like you're experiencing a disconnection issue with Bluetooth on your imx8mp board. This could be due to a variety of reasons, such as interference, power issues, or software bugs.
Firstly, you might want to check if there's any interference that could be causing the Bluetooth disconnection. This could be from other electronic devices, walls, or even certain types of lighting. Try moving your setup to a different location to see if the problem persists.
Another common cause of Bluetooth disconnection is power issues. Make sure that your imx8mp board is adequately powered and that there are no issues with your power supply.
If the problem still persists, it could be due to a software bug. You mentioned that you're using bluetoothctl and have taken HCI logs from btmon. It would be helpful if you could share these logs so that we can better understand the issue. You can post them here on the forum, making sure to remove any sensitive information.
