G0766 - erratic speed control?

When I first got my G0766 2 months ago, I noticed that sometimes the speed control was erratic. As I was turning it CW, it would speed up but it would sometimes stop. Now it seems to be getting worse.

When I first start up, I'll turn the speed control clockwise and it will start running at a low rpm. Then there may be a dead spot and it'll stop. If I advance the control further, it will restart. If I advance further, it may either speed up or stop. If I "wiggle" the speed control it seems to eventually respond. Today I was running at a low speed - - perhaps 400 rpm - - after a few seconds it stopped. When it stops, I often hear a clicking from the controller. I can get it restarted, but it is a growing irritation.

I suspect that I have a noisy potentiometer. It is a low-cost part. However, it is possible that it could be the controller. I am a bit reluctant to complain to Grizzly because the last time they sent me a new (complete) headstock it had "crappy" threads on the spindle. Also, I don't look forward to shipping back a 200 pound part. (BTW, last time I got involved with shipping something back, I ended up with a $1000 shipping bill from UPS. It was a mistake that Grizzly corrected, but there was an element of "hassle".)

My questions:
1. Are others having this problem?
2. If I pulled the cover to the controller, are there visual diagnostics that I could use?
3. Has anyone replaced their potentiometer (basically a variable resistor that controls the speed ?

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G0766 - erratic speed control?