Is the light on your gateway blinking white too? Are you also in Omaha? If so, ask Cox to "reprovision" your gateway. Or you can swap the gateway out at a store, which will have a similar effect. Not saying there is anything wrong with your gateway, just the act of swapping it out provisions the new gateway, possibly fixing the problem. Also, if/when you swap out the gateway, if you have Cox telephone service, make sure they remember to assign the telephone service to the new gateway when they assign the internet service to it or else your phone won't work.
As for why the problem is happening, specially to two different people who I assume are in different areas, I have no idea. Either a person changed how the gateway is provisioned on your account (like if you recently made changes to your service/account) or there is something broken with the provisioning system. I assume it's not a national problem, or else we would be seeing a lot more posts from people having the problem. I checked on Cox's Reddit and didn't see anyone reporting a similar problem. Some reported a problem with Cox's website and Cox's app, but nothing about issues with the service itself.