If it helps, I'm running a tube pre and SS amp.
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Seven months later, I have some progress on the issue, but also another question.
After some experimentation, I found that the cutting out only occurs when my active crossover was used in my system. However, I was not actually able to measure any DC voltage at the crossover outputs, even right at the time of the cut-out. Additionally, I shipped the crossover back to the manufacturer, who confirmed that the unit completely checks out, and that it does not have a DC leak issue.
At this point, I'm not sure how to proceed. Perhaps I should contact the manufacturer of my amp (Parasound) and ask what, other than DC voltage, might be tripping the protection circuitry? It seems like either the crossover is putting out something the amp doesn't like, or the amp protection circuitry is acting too sensitive (though it's not clear what it's trying to protect itself from).