Lately, I'm having problems with my hair feeling dry/brittle on the sides and a few areas in the back. I don't know what happen or how to correct the problem. I don't wash my hair often..mostly cowash, apply a leave-in conditioner and seal with shea butter or oil. I used aphogee keratin 2 minute reconstructor & keratin green tea restructurizer a few times. I've tried deep conditioner but my hair is still dry/feels like straw.