Micheal, you do not mention the type of vent, if you have a microwave vent to the roof, check to see that it is actually working. We have one of these, and I have noticed on a cold morning when I open the microwave, there is cold air in the microwave, hence the vent is working. I have seen at least 2 instances where the microwave had a roof vent BUT the microwave was setup for in house venting, either the fans were installed wrong, or the panel was not removed for external venting or both. You may need to remove the microwave to make a determination of how it is vented. I was lucky and was able to get a set of our house plans from the local building department, and these show a vent through the roof.
I would not go the separate detector route as this will NOT cause the other smoke alarms to sound off.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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