It's an expensive cassette with less than 3,000km on it. Not changing it. No stiff link.
Still sound like you may need to change it.
Forgive me for the barrage of question; what was the chain wear when you check it with a chain wear tool?
@edscoble started
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It's an expensive cassette with less than 3,000km on it. Not changing it. No stiff link.