I really don't know what is going on.....I will suggest that you clarify your hair with a shampoo that has sulfates but no silicones. Then try using silicone-free products for awhile to see if the silicones (if you've been using them) are the cause of the brittleness. That's what was going on with my hair.....the silicones created a moisture barrier and I couldn't, for the life of me, get my hair back to it's normal softness. Once I realized that, my hair has began to flourish.
Good luck and I hope that helps.

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3B Live Curly Live Free Analysis: Texture = Medium Porosity = Normal Elasticity = Normal
3b-ish... normal to low porosity....med. texture
Wash: Desert Essence Coconut shampoo, Acure argon shampoo
Deep Trestment: Nature's Nectars deep conditioner/styler
Condition: Nature's Nectars luv-n-a-bottle, Nature's Gate pomegranate sunflower
LEAVE-IN:Nature's Nectars luv-n-a-bottle, Natures Gate pomegranate sunflower
STYLE: Nature's Nectars Sweet Shea butter blend, Ecostyler gel
hemp oil, jojoba oil