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DAC+ Pro i2s out not working with high bitrate 44.1

I have a DAC+ Pro and am using it to supply i2s to a buffalo BIII DAC. DAC+ is mounted on a Rpi3 and I use both Moode and Rune players.

Everything works as expected, except for 44.1 above 320kbs. 48 and 96 files above 320kbs are perfect, just 44.1 files have the problem. When playing these files, I get muffled sound with lots of noise out of just one channel, I can hear the music playing in the background.

I have decoupled and filtered the power supply, added various different resistors to the i2s lines.

Is this likely a faulty 44 clock? Anything else I can try?

Thanks

Val

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