[SOLVED] Slow unstable wifi connection after installing network card into hp prebuilt

[Krypton10]

Hi there. I bought an HP ProDesk 400 G6-Microtower-PC running windows 10 and wanted to install wireless capabilities. I bought a 2.4/5 ghz wireless card (TP-Link Arhcer T4E) and installed it in one of the free pci-e slots. Now i do have an internet connection but it is terribly slow (<8 mbits in speedtest) and the 5ghz connection always drops out. Other devices in the same physical location get about 100 mbits in 5 ghz mode. I already updated all drivers, deinstalled avg antivirus, reset the network adapters, reinstalled the card itself to another slot, tried a different wireless card, reset the router, disallowed the computer to stop the card for power saving... Basically any solution that google threw at me I tested. What could cause such a behaviour? Any other device works well in the network, just that one computer acts up.
Any help is greatly appreciated

 

[jojesa]

Are you using the lates drivers from TP-Link website?
https://www.tp-link.com/us/support/download/archer-t4e/#Driver

Also try changing the DNS server addresses to a public server (like 1.1.1.1).