I think this is a derailleur adjustment issue. A prickly little problem because it's hard to recreate consistantly on the road--never mind on the work stand. Assuming no hanger alignment issues, a very minor quarter or half turn of the cable barrel adjuster on the rear derailleur will likely fix it. Problem is, which way to turn? Try and figure out (when next it happens) what cog you've selected with your shifter vs. where the chain wants to go to (the next larger or next smaller cog). If it wants to to the next larger, you need a bit more cable slack. If next smaller, a bit more tension. I don't usually run across this on my 8 speed cassettes but do so often on my 9 speed new installs until I iron it out. I set a side a short ride with some hills for this and just nail it down once and for all.
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