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CC2564C: SCO over HCI instability issue at Tx!

Part Number: CC2564C

We are designing a product where we have a need for using BLE for control purpose and HFP SCO with mSBC wideband codec for speech.

Sending SCO data over HCI seems to be the only way to support this setup, which rules out the usage of PCM.

We have applied CC2564C patch of V1.2 to the module.

We are now having audio quality issues for speech, mainly when cc2564c is sending the SCO data.

What is the reason for this instability and is there any way to make SCO over HCI more stable, for example by disable BLE, new experimental FW or something else?

/Thanks