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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Desert Essence Coconut shampoo
Condition: AO_Island Naturals, AO_Honeysuckle, AO White Camellia
LEAVE-IN: Natures Gate pomegranate sunflower, Desert Essence Coconut
STYLE: Aubrey Organics Mandarin Magic Jelly/AO B-5 gel
Staple: Jojoba Oil