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The Magnetron in your unit is no longer resonating properly. The Magnetron produces the microwave frequencies and when it resonates properly, it will provide the excitation to heat your item(s). As well, the diode that accompanies the magnetron needs to be replaced as well. Should it be under warranty, take it back. Out of warranty? Have an appliance tech repair it (usually around $175) or get a new microwave.
This is typical for most microwaves. No such thing as quality any more.
It indicates the magnetron is getting to hot "that heats the food" when that happens the thermal fuse opens to protect the magnetron from over heating and shuts it down and waits until it is cooler before it resets. The other problem could be the fan not working or not properly that blows on the magnetron, it helps keeps the temperature regulated so it can run hard. If it turns out the fan is fine, then the magnetron is slowly breaking down until it becomes unusable, which means it will need to be replaced "pricey" or buy new "probably cheaper"