Some versions of these dongles have "exclusive mode" drivers. Ensure you aren't using a "high performance" power profile in your OS that prevents the chip from entering low-power states between tracks.
Troubleshooting CX31993 USB-C DAC: Heat & Static Fixes Conexant (CX-Pro) CX31993 cx31993 datasheet fix hot
The QFN-20 package has an exposed thermal pad (pin 21, center). The datasheet mandates: "The thermal pad must be soldered to a ground plane with at least 6 vias to the opposite layer." Most low-cost PCBs have no vias, only a small pad. Heat gets trapped inside the chip. Some versions of these dongles have "exclusive mode" drivers