How are you letting it airdry? What products are you using to moisturize and seal prior to drying, and are you letting your hair dry loose or braided/twisted, etc.? For me, letting my hair airdry loose is asking for trouble (I accidentally did it a few weeks ago, and had to just go on and rewash). I moisturize my hair with a leave-in, seal with an oil or butter, depending on the weather, then braid it up. I also only leave it exposed for around 30 minutes before I put on a scarf (with little holes in it) and let it airdry the rest of the way.