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Aside from any intrinsic problem with your receiver, the usual suspects are;
1) Poor receiver ventilation.
2) Very high levels of bass.
3) Shorts in the speaker wiring.
4) A rubbing loudspeaker voice coil.
The actual switching is done by an electronic microprocessor. This electronic processor is most likely faulty by now, and needs to be replaced. Repair costs for this are expensive enough that buying a new receiver might be the best logical action, as a new comparable unit might cost only slightly more than the needed repair costs for the SA HE 200. Good luck.