You should immediately dispose of and replace your microwave when it exhibits critical safety or functional failures, such as sparking or arcing inside the food cavity, emitting a strong burning electrical odor from a failing magnetron, the door failing to seal tightly against radiation leakage, or the digital control panel malfunctioning completely. Furthermore, if the unit is older than 10 years and experiences frequent component failures, replacement is safer and more cost-effective than attempting complex electrical repairs.
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