Yes they wear out. usally the first part to quit is the unit inside that creates the microwaves called the "magnetron" over time they will wear out, and so will the circuitry that runs the entire microwave, some will last 8 years like yours, some only a year or 2. 8 years is pretty good for the life of a microwave. but yea, its time to get yourself a new one. good luck to you
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