I recently bought an AC2300 router, and it worked perfectly, until a couple of days ago, when it suddenly stopped transmitting the Wi-Fi network. I tried resetting the router, restarting the whole network, and even a factory reset. 

As I was setting it up again, I noticed my 5GHz network was unavailable due to my country's restrictions, which it wasn't at first. I looked at my 2.4GHz settings and the channel is now set to "Auto (Current channel N/A)", channel width is Auto as well. The wireless radio is supposedly on, though.

My wired network works fine, and it's apparently the only thing that works properly, as the config UI for the router is running extremely slow, unlike before the issues started.

Is the router dead, or is there some configuration that must be done to fix this? I assumed it'd be a matter of changing the country on the configuration, but if it's there I can't find it.