I think PnmnianPrincess has hit the nail on the head but I would just add one extra suggestion. Before drying and styling I ALWAYS add my argan oil leave in treatment (part of my Pro Naturals hair repair system). Add only a couple of drops to palms and rub in mainly to the very tips that are giving you the problem. This will help control the frizz and static when straightening. My G3 Salon Pro styling iron has tourmaline & ceramic plates and I do not have any dry ends or breakage.It sounds like your flat iron is losing its heat by the time you hit your ends. Make the first pass, stop, wait a few seconds, then just do the bottom half. That might help, or just going slower in general.