if your hair is anything like my hair it changes with the seasons. Its not that your hair gets bored with condish, it just need different things at differnt time. In the summer, i dont need as much mositure so i got back on mositurizing condish, but the winter is another story.
Also quidad products have some (not a lot, low on the ingredient list) silicones in them. so you may want to get a clarifying shampoo.
Also, when it seems your hair is getting use to a product, that could be because of buildup. i would suggest trying to cut out all silicones and see out that helps. And as cubad curl pointed out your hair may be sentive to protein. cut them out and see what happends. good luck!