It almost sounds like a short in one of the speaker circuits and as the radio amplifier gets overloaded and starts heating up, it shuts down to protect itself.
When the speakers stop working, does the headphone jack still have an output? In other words, if you plug in a headphone set, can you hear anything? If so, it's not the "front end of the stereo, but the amplifier end".
Next, at the back of the stereo, disconnect all but one set of speakers and see if the problem goes away. If it does, then disconnect that set and try another set of speakers. If the sound does remain working, then add a set of speakers and test again. Sooner or later, adding a set of speakers will probably identify which wiring/speakers are the problem.
My guess is that it's either a bad speaker or a speaker wire with a staple or screw through it, grounding the system and causing a short.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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