The only thing that I can think of, and it is nothing more than an uneducated observation, is that the only thing that the two computers have shared in common since I last knew that 5GHz was working on mine-and not having checked hers for an unknown time span-is the interim updates to Windows 10 Home 1803, as though something in Windows is blocking 5GHz. When Centurylink eventually started working, I checked my smart phone, which uses the same WiFi as the computers, and it was connected at 5GHz, meaning that the router was set correctly. I added 5GHz, which still did not show in Show Available Networks. Some investigation found that 5GHz was also not shown on my wife's computer, with both 2.4 and 5 shown in Settings/WiFi/Manage Known Networks, but the 5GHz had been removed from mine. Yesterday morning, when I found my machine off-line, and the DSL Internet light blinking wildly, the first thing I did was to click on the task bar icon, only to find that only the 2.4GHz setting was there. We will assist you with the best and simple advance measures to fix it out.I know that it was there on my computer, perhaps a month ago when the WiFi card was replaced, and I know that both the 2.4GHz and 5GHz entries were there on both computers in the past.
If you are still struggling with WiFi drops issue, feel free to share with us through comments. But for that, you require the IP address, username, and password. There can also be a possibility that your connected device has forgotten the network SSID name and the security passphrase key. If you have disabled this, the home Wi-Fi network will not display up on the list. Network SSID name makes the Wi-Fi network visible to all your Wi-Fi enabled devices. So, try to restart your home Wi-Fi router and the modem, as this might help you in fixing your wireless network drop issue. Sometimes, most of the Wi-Fi router problems occur due to the interference of other Wi-Fi enabled devices.
So, what you can do is to download and install the firmware version by a simple visit Restart your Wi-Fi Router
If you are struggling with a continuous drop in a wireless network, then it might be probably due to the corrupt, missing, or outdated firmware version. The router firmware allows your operating system to set up communicate in-between the computer and the Internet. Once you enable WLAN settings, the wireless network adapters are installed on your computer automatically and become available. The WLAN AutoConfig option can configure both wireless security settings as well as network connectivity. If your computer or laptop does not have the shortcut key, try to turn on your WiFi from the taskbar or enable it from the ‘Open Network and Sharing Center’.
Most Wi-Fi-enabled computers and laptops have a pre-defined key to turn on or off the wireless network. Try out the first method mentioned-below, if it fails to fix, move to the next method and so on: There is a list of distinctive fixes to solve the Wi-Fi network disappearing problem. Unique Ways to Fix Wi-Fi Network Drop or Disappear Issue