Is that likely to be the freehub causing that?
Yes, but it's normal. It's only too much freehub drag if the top run of the chain is drooping visibly when you freewheel while holding the cranks stationary.
It has done that a couple of times now that you mention it
@mrJL started
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Yes, but it's normal. It's only too much freehub drag if the top run of the chain is drooping visibly when you freewheel while holding the cranks stationary.