Original plugs or replacements? I had the plug caps fail on my '09 XP and was told that it was caused by using the hollow tip plugs as replacements. The irony is that I bought them from the same source that gave me that guidance, and they didn't offer a choice when I bought them. Personally, I'd replace the plug wires when you replace those plugs, as it's relatively cheap. The wires pull out from the coil, as opposed to screw on caps. Get an extra plastic retaining clip or two, as the OEM one will break when you remove the wires and it's a bit of bi_ch getting the new one on without breaking it.
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