My curls tend to fall and lose definition if I've over-conditioned or have used super-moisturizing conditioners, treatments or styling products.
Just my two cents.
Hair Type: 3A/3B; natural color; mid-back length.
Daily: shampoo (varies)
Weekly: Neutrogena Anti-Residue Shampoo.
Fave Rinse-Out Conditioners: HE Hello Hydration; L'oreal Everstrong.
Styling Routine: Squish-scrunch product /conditioner into soaking wet, upside down hair; plop for 10 minutes, air dry. (Diffuser dry front section.)
Fave Styling Products: Tigi Curl Amplifier Creme; Batia & Aleeza gel; Giovanni Sunset Styler; LA Looks Sport Gel.