I Have bought TP-Link Archer T4U V3 half a month ago, downloaded and installed drivers from website(not from CD) and everything worked great, until power outage last night. Today 5GHz network started having problems.

First I noticed that connection was marked as "Network connection established, No Internet connection found", although my smartphone was connected to the same network(5GHz) and using Internet. So I decided to open routers webpage, but it could not be opened. Opening the same page on smartphone worked fine and showed all that the other devices were working fine, except there was no PC with the TP-Link adapter. After trying to reboot PC adapter stopped displaying 5GHz network completly and showed only 2,5GHz from the same router and one of the neighbors router(usually theres around 10).

After connecting to 2,5GHz, Internet was finally available and 5GHz(along with other networks) showed up in the list, but it was greyed out(as in bad connection strenght). Trying to connect to it always resulted in wireless networks list going empty and Windows playing the "device disconnected" sound. After a few tries to connect, unplug the adapter and reinstall drivers(after reinstalling i could connect to 5GHz, but Internet and router page were unreachable) i tried to change the USB port and now it's not only connecting, but even lets me use Internet.

Before it was plugged in the back PC pannel(USB 3.0), now it's on the front(USB 3.0). Trying to plug it in to the other back panle USB ports(there is 2 USB 3.0 and 2 USB 2.0 ports), none of them detect 5GHz.

Please help, the adapter is too big to let it stay on the front of the PC and I'm afraid of damaging it.