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Is it common? No. At least there aren't many threads revolving around that short of a coil life. The delphi's do appears to be more fragile and go out quicker than the Eldor coils. BMW now uses Eldor for coils. They are apparently better compared to the Delphis. I am planning to switch to NGK (not the step colder ones)/Eldor set up when I go stage 2. You should not need to go colder on plugs for stage 1. PFT says no hardware modifications are needed for stage 1. With that being said, everyone's motor, gas, and environment are different.
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