Make sure your dryer vent isn't clogged. Check regularly.
Symptoms: damp clothes, little or no lint in the trap.
Possible result: fire, and mild irritation when you put on damp underwear.
Challenge: crawling through the attic in 120 degree sauna-heat (may want to save this one for winter), plowing through mountains of fluffy irritant-laden insulation to find where the big silver tube connects to the outside vent. But it's worth it when you don't have to run your dryer 3 times to get dry socks.