My EOS 70D has started giving a BUSY message everytime the shutter button is pressed if the flash is opened automatically or manually. The message appears for about 10-15 seconds and then an Error code 50 message appears. I am also getting a fairly persistent message that says "Faulty communication between lens and camera. Clean lens contacts with soft microfiber cloth and reinstall." I have done the requested cleaning multiple times on each of my three Canon lenses. The described problems occur with all three lenses. I have also turned the camera off and back on multiple times and have removed the battery and reinstalled multiple times as requested by the Error code 50 message. Nothing has helped. Any thoughts?
