Hi, i've got the same problem from couple of days. My adapter can detect 5ghz network, but after trying to connect system shut down it after 10s and then there is no network on wifi list, after 5s available wifis show up and there is a message that it cannot connect to the wifi (5 ghz). I can connect to 2.4 ghz network but the speed of connection is really low 5mb. It used to be more than 50 mb. I checked speed on the other device and its correct, so its definitely problem with adapter. I tried change adapter to other USB ports and tried to reinstall it. Nothing changed :(

 

I have win10 64bit.

It's a little mistake. I have adapter: Archer T2UH v2.0, but problem is the same.

 

"Did you try to forget the network and reconnect to it? Does it work?"

Tried and it doesnt work.

 

"Meanwhile, you can change the wireless channel of the 5Ghz on the main router. Like channel 36, 40 or 44. "

Changed to 40 from 36 and it didnt help.

 

"Have you ever tried to update the driver to the latest one? "

Yes, I updated to the latest version.

 

"Besides, do you have any other computer we can do a comparison analysis?"

I check my network connection speed on mobile phone, i dont have other computer.

 

Below you have list of devices connected to my router. As you see there are 2 devices connected properly to 5 GHz. Device "Desktop..." is the one with adapter.

 

 

What else can i do?

 

Hey everybody, I have a similar problem. I'm using the Archer T2UH and can't connect to the 5ghz network either since last week. I can still see and connect to 2,4ghz networks, I can still see see the 5ghz network, I just can't connect to it. 

 

Now afaik there was no Windows Update in the last week for me, the only thing I changed was unplug the adapter and plug it in again (then it stopped working). I had already tried what was suggested on this thread to no avail, resetting the router didn't work either. I also just downloaded the newest drivers and it didn't solve the issue.

I don't get error messages, instead the TP-Link configuration utility starts lagging and doesn't respond for minutes. This doesn't happen when I connect to 2,4ghz, there it connects within a few seconds.

 

It might not be the exact same problem, but I figured it's similar enough to use this thread.

The guy at the tec support did all the things from the above and still nothing. He sad after two hours of talking at the phone that the problem is from a windows update and he will call when the things get back to normal. I've been waiting for a week now and i think im going to refund the adapter and buy a new one from another company.

Installed the driver and it didn't change anything, still the same problem. 2,4ghz works fine, 5ghz takes ages to connect and then fails saying the key might be incorrect.

 

Installing both the utility and the driver resulted in not being able to find any networks after a few minutes. At first it was basically the same story but with different software, then all networks disappeared. After deleting and re-installing everything I'm back to being able to connect to 2,4g at least.

The win updates are turned off i installed the driver and still nothing. im going to leave u a link of a video i made that show s what happens when i try to connect to 5ghz. 

 

https://youtu.be/PD56PRAvFAk 

If we cant make it work im going for a refund...