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Is the belt wearing out or are ribs breaking off of the new belts?
Thank you. It is very hard to know if there is an alignment issue. I would remove tension from the belt and feel the tensioner. If no components have been replaced my suspect part is going to be the belt tensioner itself.
In order to see where the issue is have you watch all pulleys that use ribs and see if any are wobbling?
I wouldn't change all pulleys. If you have a bright light to watch everything as the vehicle is running.