nrf52840 i2s power consumption

I have a custom board using a nRF52840.

A part of the configuration is a Analog Devices MAX98357AEWL+T Class D amplifier which is driven by i2s0.

When the board is idle (just advertising) current consumption per my power profiler is 68 micro-amps -  a higher value than I expected.

If I remove i2s0 from the configuration by:

        1. taking it out of app_overlay       and

         2. modifying the firmware where appropriate

Idle current consumption drops to 38 micro-amps - a value closer to my expectations.

It appears that Power Management is not imppplememted on i2s.

Is there any way I can get the lower consumption with i2s enabled.

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