My gfs envoy does this stuff too. Weirdly i found a wiring harness under the driver seat that has a mind of its own. When these problems happen look under the driver seat and move the wiring harness around. It fixed my problem, it may be a connection that is not making good contact in that harness.
My heated seats, easy exit seat, cruise control, and odometer lights were all effected by this one harness
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