All outputs are sometimes unstable (attached capture). The part is in play mode with an input of all zeros. No faults or warns are present.
Sometimes the instability can be stopped with HiZ mode, or the EVM standby switch. Other times this does nothing, and grounding a clock is the only thing that will make it stop. The power supplies and input clocks look ok. I2C is responsive.
Sometimes the part is producing a zero output without the instability. Sending audio always provokes the issue.
What might cause this?