Just a thought here. I assume you are not riding on the smoothest of roads. You need to leave about and inch free play in the middle of the bottom row of chain. measure this with the bike fully loaded and you sitting on it, resting on its suspension, not centrestand. I think the previous person who wrote 20% meant 2% and it was just a typo.
But once they start to go, they will go, so fit a new chain, and check both sprockets are good. Any one thing bad will ruin the other two. Is your rear suspension stiff enough for the load?
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