Something tells me that you changed some other ignition component just before your Denso plug died. If not, then you need to. There is no way you could get 3 bad plugs in 6 months.
You didn't say what your plug looks like....can tell a lot about how well adjusted things are by looking at color and condition of plug.
Make sure gap is correct, and the ground strap from valve cover to frame is connected to good, clean, unpainted, point....but I still think something upstream of the plug is the cause of your problem.
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