No response on throttle stick

My throttle does not respond. The drone has red lights solid in front and slow flash green in rear. Gimble and the camera is working, controller has a green light. My Galaxy A50 phone will activate one time take off for a brief time. No response from controller throttle sticks, rotors wont run even with CSC . I use the DJI Go app, and Litchi app. I also noticed that when I try to connect the my drone Wi-Fi, I get Wi-Fi not connecting . Controller and drone battery’s fully charged and functioning. Controller and drone do pair, but won’t run.
Can anyone help?

I have some questions for you:

  1. What changed between now and the last time all worked as expected?
  2. Which message is displayed at the top of DJI GO when you’re attempting to start the motors?