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TAS5630B: have output short to GND issue

Part Number: TAS5630B

Dears,

We use TAS5630BPHDR to drive 2 speaker, during the using,some pcs occur damage.

we test the phenomenon is:

1. TAS5630B's four output PINS(OUT_A/B/C/D),one of them short to itself GND(GND_A/B/C/D).

2. PIN-15(/SD) assert to high.

3. PIN-19(READY) have no output.

PVDD is 48V, it is boost from 12V lead batteries.

every speaker is 8ohm/150W;

PWM frequency is 400KHZ;

the output mode is AD MODE.

Design ref below:

  

Pls help us how to debug ,thanks very much!!