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I actually have a feeling it's the freehub sticking so whe I'm in a high gear, cranking and suddenly stop, the cassette is spinning still and the top run of chain slackens off. I have the same issue on my Hope gravel wheels because the green seal is a bit shit so the whole thing grips a bit. You don't notice when pedaling but when wheeling the bike, it acts like a fixed gear.
I'll probably do as you suggest anyway and give it a clean at some point but I'll also have a clsoer look at the freehub.
Speaking of which, you've just reminded me I need to google how to adjust an XT clutch. IIRC there's a screw on the side that adjusts the tension. I'm getting chain slap even with the clutch on - it's not grippy enough.
https://www.bikeradar.com/features/how-to-adjust-a-shimano-shadow-plus-clutch-rear-derailleur
Nope, that's for older shit
https://www.youtube.com/watch?v=xUS0VAKP1Ys