The problem is fixed. I now pay $10/month for Cox Care. A technician came with a fiber optic power meter to find out the signal power was way out of specification. The technician trim the line from both the inside and the outside of the house to get the signal within range in less than 15 mins. I reboot the ONT and the EERO twice before everything works as expected.
This whole issue can be avoided if the installation technician verifies the signal power before connecting the fiber line to the ONT the very first time. Not blaming the installer but the management for lack of procedures training.
