I'm not sure what's going on but for some reason my counter has started to miss counts. Thinking it was the sensor I replaced that and no change to the problem. I purchased a new counter and attached the new sensor and... no change to the problem! Then I thought to check the voltage going in to the counter. I've been using a car battery charger as a PS and it seems it only puts out 10vdc. I found a wall wart that puts out 12vdc and tried that with no change either. At this point I'm scratching my head! The only thing that hasn't changed is the motor and PWM. Has anyone else encountered prox sensors failing or counters that skip counts? It seems when I slowly pass something conductive in front of the sensor it works fine but anything at normal winding speed seems to fail badly. 
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