Network issue. Wifi drops minutes after login. (DNS timeout)

Leon Robinson said:

Hello, everyone.

The wifi connection drops let's say 1-2 minutes after login. The net icon in the tray doesn't change mode from connected to disconnected, so you don't know exactly when it happens. More, it happens with ANY wifi connection (not only the one in my house). I took a look to the event viewer, it talks about a "DNS Client events": No DNS server answered (Timeout in name's resolution). Usually, after reconnection, the wifi is stable, but it drops again if I connect from sleep mode.

Everything began after update to a new build (1903, I guess; I'm using 20H2 at the moment, same problem)
It didn't happen with build 1511.
I have a Lenovo ideapad Yoga, with a Realtek RTL8723AU Wireless adapter.

I tried, without success, all the following:

- whole network reset
- adapter uninstall and reinstall with drivers taken from Lenovo
- reinstall Windows
- others that I don't remember

Actually I'm giving up with that because I really can't find any solution, so any suggestion is very appreciated.

I also thought about this workaround: is it possible, at Windows start, to launch a batch file that automatically, after 1 minute, disconnect and reconnect the network adapter? If yes, can someone help?

Looks like you covered most of it.
One of most overlooked problems with WiFi is signal loss.
It may be due to many factors.
One is that the signal strength from your computer and modem / router
isn't strong enough or there i interference (electrical equipment, Neighbors
WiFi.) the 2g bandwidth tends to get cluttered as most folks never even
change the default channel of their modem/router.
Consider downloading a WiFi Analyzer which can show which channels
your neighbors are using as well as yours .
Then goto the modem/routers setup (usually a web page)
and change your channel to one that isn't being used much.

See if that helps.

When it drops open cmd prompt type

ipconfig /all

post results its not a dns problem it gives that error as it cant reach dns its worth setting dns to 1.1.1.1 & 1.0.0.1

Leon Robinson said:

Hello, everyone.

The wifi connection drops let's say 1-2 minutes after login. The net icon in the tray doesn't change mode from connected to disconnected, so you don't know exactly when it happens. More, it happens with ANY wifi connection (not only the one in my house). I took a look to the event viewer, it talks about a "DNS Client events": No DNS server answered (Timeout in name's resolution). Usually, after reconnection, the wifi is stable, but it drops again if I connect from sleep mode.

Everything began after update to a new build (1903, I guess; I'm using 20H2 at the moment, same problem)
It didn't happen with build 1511.
I have a Lenovo ideapad Yoga, with a Realtek RTL8723AU Wireless adapter.

I tried, without success, all the following:

- whole network reset
- adapter uninstall and reinstall with drivers taken from Lenovo
- reinstall Windows
- others that I don't remember

Actually I'm giving up with that because I really can't find any solution, so any suggestion is very appreciated.

I also thought about this workaround: is it possible, at Windows start, to launch a batch file that automatically, after 1 minute, disconnect and reconnect the network adapter? If yes, can someone help?

Hi Leon,

as thomaseg1 mentioned, quite often poor wifi performance can be attributed to (1) signal propagation problems in your home or (2) interference from neighbors using the same wifi channel.

(1) I would start with, open an elevated command prompt and copy & paste or type;

Code:

netsh wlan show interfaces

followed by enter. This will show the current interface in use along with the channel number and signal level. If the signal is below 75-80%, you might try repositioning your wireless router or the position of your computer to increase this value.




(2) Next, in the same elevated command prompt, copy & paste or type;

Code:

netsh wlan show networks bssid

followed by enter. This will show all acquired wifi signals that your wifi card is currently receiving. Sometimes, networks will show in this command line that don't appear in network shortcut on the taskbar.

Examine this result to see if you have neighbors that are using the same wifi channel and/or are generating a sufficient level of wifi signal that results in a high received signal value on your wireless network card.



NirSoft's WifiInfoView will allow you to see the identity (ssid), wifi channel and received signal level in a clean presentation that allows you to easily compare your desired wifi signal with those that might be causing you grief.

https://www.nirsoft.net/utils/wifi_i...tion_view.html



Please post results of both these command lines and the wifi analyzer.
Thanks