DAC problem... cracking on speaker...

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I am trying to troubleshoot this problem but its beyond my level. I built the ezDAC and it works for a little while then it starts making loup crackling and popping noises ...

I measured the DC offset on each channel and its only 4mV on the right and 2mV on the left.

What could be causing this issue?
 
So I think I figured it out. It was a power supply issue. I was supplying the DAC with +/-13.86V DC from an eZDual which appearently wasn't enough, so I had a Twisted Pear LCBPS which I could adjust the output so I adjusted it to +/-15V DC and I have no more crackling. I tested it for about 15min and it sounded good. Using the ezDual it took about 5 min and the crackling would start, so I imagine the opamps weren't getting enough juice...

Does this line of thinking sound right... I'm learning here!
 
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