Sound cutting out at high volume

I have just setup a pi 3b+ with an AMP+ running picoreplayer.   Everything is running great at lower volumes.  When i turn up the volume to about 3/4 the sound starts dropping out.  I can turn down the volume and then everything is back to normal.  I am using a mean well power supply at 18V to power the pi/amp+.  Any ideas on what could be the issue?


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