When a Frigidaire microwave runs normally for approximately two to three seconds and then shuts off abruptly, the shutdown is typically triggered by a built-in safety mechanism. The most frequent culprit is a failing or intermittently dropping door interlock microswitch that loses electrical contact, or a tripped thermal protector/thermostat caused by a blocked cooling fan motor. Additionally, an electronic control board glitch can cause premature relay disengagement. You can troubleshoot shutdown issues safely by unplugging the unit, letting it cool down, and inspecting door switches. You can verify that your corrective action is successful when replacing a faulty door switch or clearing vent blockages allows the microwave to run through a full heating cycle without shutting down.
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