...that using dryer sheets can coat your dryer filter with a coating that makes it difficult for water to evaporate?
One of my friends shared that with me about 6 months ago and I shocked the hell out of her by saying yes, I had already heard of that happening.
So once a month I scrub my filter and rinse it under boiling hot water until all the water runs thru.
Another household tip you might be interested in : once a month I dump a cup of baking soda, followed by 3 cups of vinegar then I run hot water down the drain for about a minute or so. Keeps your drains fresh and clog free. And very environmentally friendly to boot.