Another Microwave that shuts down after 3 seconds... (by 3 users)

This model uses an inverter to produce high voltage. That symptom is an usually indication of a problem with the inverter.

Due to the lethal voltages involved, I do not recommend that a person without training and experience ever work on these models.

And of course at less than 1 year, this would still be under warranty if you have your sales receipt.

You should be able to locate a Panasonic-authorized servicer here:

http://www.pasc.panasonic.com/WhereTo/Fi...

I would mention the exact symptom when you call so the technician can bring a new inverter with him when he comes out to repair it. Might save you having it pulled into the shop.

Good luck!