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Power outage
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this post was submitted on 27 Dec 2024
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My guess is that there's a capacitor in there somewhere. The capacitor stores enough charge to keep the time for short periods (like a power flicker). But it's unreliable for longer periods of time (beyond a few minutes) and will cause clock drift.
So, when the power goes out for a medium length of time, the microwave resets to 12:00 to indicate that you need to set the time again
However, if the microwave is left unplugged for an extended period of time (a few days to weeks), the capacitor is fully drained. My guess is that this causes the time to be set to --:--
Why it would be designed like that? No idea
interesting theory, thx!