lm3875 question

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I'm having a strange problem with a gainclone I jut built. When I first power it up, it sounds great, but then after a couple of seconds a fuzzy distortion sets in both channels. If I power off and back on, the same thing happens. The heat sinks are not too hot. Any ideas what it could be?

This is the first time I'm using non-insulated chips. I have properly insulated them with mica. No shorts anywhere.
 
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