Try the chipmaker's driver(RTL8192CU). http://www.realtek.com.tw/downloads/...Downloads=true If the problem continues, can you change some wireless settings on your router like channel?

xzeeno wrote Hi Diamond Archer D9 ( Firmware Version:0.9.1 0.1 v0041.0 Build 150514 Rel.54055n) latest fw Changed ISP recently and still was having same issues, highly doubt a WAN would be affecting...

Upgrade the latest firmware (TD-W8980_V1_150514) first. http://www.tp-link.com/en/download/TD-W8980_V1.html#Firmware After upgrade, reset and reconfigure it. If the problem continues, you can try...

With WN823N installed, you can detect the Wi-Fi network but fail to connect? Any error message? You'd better describe the problem in details.

improve streaming content? Do you mean improve the speed?

Have you tried to reset them to factory defaults via utility? http://www.tp-link.com/en/download/TL-PA6030KIT_V1.html#Utility http://www.tp-link.com/en/faq-312.html After reset, if still no powerline...