Been doing cornrows, front of hair always breaks/never stays in braids. Any ways to solve this?

4c hair, low porosity. So basically I have been doing only cornrows for the past year. The longest my hair has been out of cornrows is generally 1 and a half weeks. I do not use a satin/silk pillowcase. Every time I do them, the front of my hair breaks and comes out of the braid. It is not like I'm balding or the hair just isn't there, it is just too short/weak to stay in the braid and isn't growing.Does anyone have any tips to cure this?

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