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How often does it occur?
You may be looking at a bit of crap on one of your gears and every complete cycle of the gear it 'hops' over the piece of crap......only way to fix it is pull down and clean I'd suggest.
Best way to test this would be to time how often it 'randomly' occurs. If the random occurrence is the same timing between events then this is definitely the issue.
Oh.....and if it is a piece of crap on the gear you don't have a guiding issue.....guiding is working awesomely!
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