Using on induction Jennaire cooktop, sometimes large burner 12" wont stay lite when pan is cooler say 68 degrees in kitchen, I move to a 6-7" burner this stays on and magneticly engages ok, heat pan on this burner on medium heat for 3-4 mins. Move back to large 12" induction element on the cook top no problem then.. cooktop is only few years old and works perfect on steel cookware. I just think Ninja should "know about this" is the only dislike I have and can live with it. Just needs alittle more metal to excite the induction process, I dont think replacing it would help unless minor design changes were to enhance the magnetic qualities.. i7