Agree: Grab the chain mid sprocket and pull strait up. It should barely move up on the sprocket. If loose check the chain guides and tensioner. Tensioners are known to go bad from time to time. Pull tensioner and check that it stays in the extended position. Also make sure the tensioner spring is not broken or missing. If tensioner is good then check the chain guides by pulling head. If they are good then the chain has stretched.
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