I have a large Panasonic microwave (inverter) and since I check it for leaks using two meters (digital and diode/meter) in the usual way. Well, lately, suddenly, it started to put out an unsafe field from the mid-section of the door (7-10 mW/cm2 max.) that varies over the visible part of the grid and can reach zero at the edges. The seals around the door don't leak measurably at all when firmly seated. I thought the metal grid in the door could never leak or deteriorate. The peaks appear as hotspots and trail off to safe (not zero) limits within a 3 inch circle on the facre of the door. I will continue to use this appliance style microwave and can fit it with copper screen that I have for other microwave equipment if I have to. I am inquiring here about the abrupt onset of leakage because it is baffling to me since I have several much older microwaves that never developed a leak through the door's window.
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