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@TheBrick(Tommy)
Every time there is one of these threads it turns out to be a cog slipping problem. Yours may be the exception, it's possible but unlikely. Take off lock ring and cog, check threads yourself.
Otherwise check chainrings bolts, crank bolts, feel for b.b play and roughness, feel for cone play on the hub check your track nuts are tight, all after you've check the hub threads,