Internet connectivity issue R6400v2

Thank you so much for replying, but I'm afraid I don't know how to answer your questions. The Netgear router that we have was working fine with CenturyLink for 4 years, and then I reset it one day (my kids iPads weren't connecting to the Internet so I pressed the button on the back to reset) and the Internet symbol has been orange ever since.

Here is what I do know, which isn't much:
- Our WiFi network can be found on our phones and iPads but going to settings. It's right there, but has no Internet connectivity.
- The Nighthawk app can find our router when we connect to the router's WiFi on our phones. It says Internet: Online in the top-right corner
- When we test our Internet Speed we get a good upload speed but nothing for download. I've added a screenshot to show this.
- When we go into WiFi analytics it states that our signal strength is amazing, and even tells us to move away from the router if we're a little too close to it.

As older millennials, we just don't understand the inner workings of this magical box, only the frustrations of having it go wrong. If you need me to provide additional details please could you tell me how to get them for you?

Thanks again!