Diagnosing wild servo motion

[/RaspberryPi]

I am trying to troubleshoot a servo I am controlling with a raspi. The servo sometimes when moving starts to make wild uncontrolled motions, often including several 360 degree turns. This seems really strange. I tried twl power supplies. Not sure if it's just a bad servo or something I can fix.
submitted by /u/mikeinmlb
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Source: https://www.reddit.com/r/raspberry_pi/c ... vo_motion/