@tkfrick , Check and see if iron is still under warranty and return as defective for refund,replacement or repair. If your curling iron is getting too hot and the temperature control select switch/thermostat is not controlling the heat setting as it was before, the switch is probably faulty.
Replacement parts are available through the manufacturer's website, beauty supply stores, or online some times. Link to contact hot tools below. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
http://www.hottools.com/contact-us/