Thanks for the reply pindude.
I did swap out the cpu and stuck in a new altek cpu. The effect was there just more faint. I was chalking that up to new headers on the new altek making better connection? BUT the effect was still present. So might be a playfield issue as you suggest.
It almost sounds like your coil is heating up with use and expanding a little and causing the plunger to not run smoothly through the coil sleeve which would be odd on a newer machine. You could remove the coil and see if the coil sleeve is still moving in and out of the coil nice and easily...
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