The ddt circuit on this amp is goofy, they use a 4060 opamp with the inputs at -14 to -15V, the spec range is only +/-12V. So it is possible for it to nuisance trip. There is a button on the back to disable the ddt, try that. I've alos had luck replaceing the 4060 with an LM358 whose input spec is not violated in this application
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