Yeah, that's one thing you have to watch on the 20V's Rich. Especially the one's with coil packs. I've found new plugs don't seem to move much after fitting, but if they've been removed and put back they can become loose over time. Maybe due to the crush washer becoming less effective.
I tend to check the plug's are torqued up at every oil change (6mths or 3k miles).
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