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That louder humming noise means that your magnetron isn't working properly. This is the part that actually creates the microwave to heat your food which explains why the food isn't heating up anymore. The part itself costs about $122 so depending on the condition of the microwave, it may be better to just replace the microwave rather than repair it. Also, it will require you to un-install the entire microwave and remove the outer shell in order to access the magnetron for replacement so if you called a technician out it would be another $150 for trip and labor. Below is a link to the magnetron you'd need to order and replace for your model number.
CLICK HERE for magnetron
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