Netgear AX1800 4-Stream WiFi Mesh Extender

I purchased a Netgear AX1800 4-Stream WiFi Mesh Extender and got it installed successfully. It appeared to work correctly until recently when the Router Link LED was occasionally amber. I tried to troubleshoot through the NightHawk app, and it couldn't connect to the router. I tried all of the solutions I could find on the internet (rebooting everything, checking firmware updates) including resetting the router, and nothing has worked. I couldn't even get the NETGEAR_EXT wireless connection to show up anywhere (phone or computer) until I renamed the SSID to that in the mywifiext setup. Once I did that, I could see it in the listing, but on my computer I get the "can't connect...", and when I try to use the app on my phone, it tries to connect to the NETGEAR_EXT, but when it does that, the NETGEAR_EXT disconnects and there is no wireless connection, so the setup fails. I just really want it to work. Any suggestions? Thank you.