Sounds like to overheat device(s) kicked in. Is the background cooling fan still operating? i.e. that is the fan that continues to run for about 10 mins once everything on the device is switched off.
As well as hearing it, you should be able to feel a gentle draft of air coming out of the gap between the top and bottom doors.
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Don't really know the answer but have you actually lost power to the bottom oven? i.e. do the lights come on and does the fan still turn and the same for the top one, do the lights come on when the oven is set? As a thought, did you suffer a power failure which didn't reset the clock properly when the power came back on?
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