When a Panasonic microwave oven starts normally but abruptly shuts down and stops running after only two to three seconds, the premature cutoff is almost always triggered by a built-in safety protection mechanism. The most frequent culprit is a failing, misaligned, or intermittently dropping door interlock microswitch that loses electrical continuity the moment the cabinet vibrates, tricking the control board into thinking the door has been opened. Another common cause is a tripped thermal protector or thermostat reacting to a blocked ventilation path or a stuck cooling fan motor. You can troubleshoot shutdown issues safely by unplugging the unit, letting it cool down, and inspecting the door latches. You can verify that your corrective action is successful when replacing a faulty door microswitch or clearing vent obstructions allows the microwave to run through a full heating cycle.
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