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Microwave - Door Loud, Hard To Close, Starts as Soon as the Door Closes

The difference in the door noise is due to a firmer spring in the door latch; this is a normal condition for the microwave. You can lift up on the latch to feel the tension.

When the door is closed, the microwave isn't really starting; the fan is coming on in anticipation of the unit starting. Try shutting the door firmly three times to avoid the fan sound in future use.