For some reason, your magnetron is overheating and the thermostat on the magnetron is opening up or tripping to interrupt power to the unit. It's a safety device to protect the magnetron which can be destroyed by high heat.
First of all, make sure your cooling fan is running and if it is an over-the-counter type microwave, the filter maybe clogged or the exhaust duct may be clogged or there may be an animal has built its nest in the outside vent on the side of your house.
You can get parts at affordable prices for most models from The Pros by entering your model number here:
http://tinyurl.com/gv383
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