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It sounds like you understand that the exhaust fan is SUPPOSED TO come on when the microwave oven gets hot when exposed to the heat of the range below it, since you mentioned that no burners are turned on. So in that case, I'm pretty sure that you have a bad fan thermostat. It's usually located behind the control panel on the bottom (inside bottom) of the microwave floor.
If you got it hot enough from your soup there is a fan switch to turn the blower on to cool the unit. Maybe next time cook that on a different burner on the stove to try to not heat up that area under the microwave.
This sounds like a thermal protector is turning the microwave off. If I were to hazard a guess, it would be the magnetron (produces the microwaves) is overheating causing the shutdown. If the fan was not running it would create the same condition by causing the magnetron to overheat.
what this means is that your oven has develop a partial contact from the wire which supply power to the fan of your oven
what you need to do to fix up your oven is to unscrew the oven then trace the wire down to the fan you will see two wire red and black or white either of this wire is touching the body of the oven this while the fan come up it self then make sure that all wire are well place on there position
I have the exact same problem with my Kenmore Microwave model 721 that we bought in October of 2005. The Fan will just randomly turn itself on even when we are not cooking. It has been doing this for the last few months and is starting to become more frequent. There is no way to turn it off except to unplug it for several hours. Was there a recall for this defect ?
Your microwave turning on by itself is a "self preservation feature" of the GE Profile Advantium and maybe some other models. Read the manual, When your over the range oven gets warm enough, for whatever reason the venting fan comes on until a satisfactory oven temperature is reached. You are not permitted to shut the vent fan off. Also it seems a temperature near room temp must be achieved before it shuts the fan motor off, it is very annoying. We had to return our Advantium because of fan noise. I configured the ovens vent fan to the recirculate direction because we do not have a vent duct that exits the house over our range. When the vent fan acting as the ovens cooling fan automatically turned on we would have to leave the house to hear each other talk. Too bad we really liked the oven other than that major problem. G-Man