When an LG microwave oven keeps shutting off prematurely mid-cycle or failing to complete a heating program, the malfunction is typically caused by a triggered safety mechanism or an electrical supply fault. Common culprits include a failing or loose door interlock microswitch that loses contact due to cabinet vibrations, an overheated thermal protector or thermostat shutting down the unit due to a blocked cooling fan or dirty grease filters, or a loose power cord connection. You can troubleshoot shutdown issues safely by unplugging the unit and inspecting internal components. You can verify that your corrective action is successful when cleaning blocked ventilation louvers, ensuring tight electrical connections, or replacing a faulty door switch allows the LG microwave to run continuously through a full heating program.
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