transmission lights keep flashing on 2001 Lexus IS300

my is300 transmission lights keep flashing constantly even though it changes smoothly

Asked by for the 2001 Lexus IS300
Check the transmission fluid level. If the transmission light is flashing the car's computer sees a fault with the transmission or transmission controls. You will need a scan tool to retrieve codes stored in the computer to determine the fault.
These transmissions don't give a lot of problems in my experience.