I'd tend to look at the silver shifters as the culprit, especially if you're running a 9sp cassette. There's enough "slop" between clicks in the ratchet system in those shifters that even if the shifter is tight enough, derailleur/chain placement will be imprecise in some gears. In that case, a tiny amount of frame-flex-induced cable pull may tip it into an adjacent gear. This would be less likely with 7/8sp cassettes.
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