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I have one thread of thought that goes about like this: something in the system's brain is gradually heating up, and the hotter it gets, the more it skews the behavior. It shouldn't be overheating, but either there's a cooling fan that's not running, a ventilation path that's blocked, or a component running hot. If that's the case, it strikes me as unlikely to be a sensor, possible to be a simple blowing out of the cobwebs, but also possible to be a dying HVAC controller ($$$).
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