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TAS5825M: Problem with power output PBTL

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Part Number: TAS5825M

I have run into a strange problem . I am running a three TAS5825 system with 2 stereo and 1 subwoofer channel PBTL .  The schematic is copied from the the data sheet with 10uh inductors

The left/right channels can outputs( stereo amp can easy produce 26 watts into a 4ohm load. However, the subwoofer amp quits at anything above 20 watts ( 80 hz).

I am not getting  error codes from the fault or warning registers. The 0x68 register indicated sleep mode.

I am baffled , because the same circuit cranked out  almost 50 watts with an almost identical layout.

I am  looking for any hints on what to look at.