Unit shudders violently upon initial driving and stopping( only intermittently- while trouble shooting the shudder will go away). at high speed its ok but still a little noisy. Ive replaced the encoder bearing and it worked for a little but then will come and go again.ive eliminated the brake from the system so its not that. definitley seems to be a magnetic problem as you can see the drive tire jump backwards at very slow speed. Any ideas?
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