I have a HP Pavilion laptop running Win7 Pro. It worked fine with TP-Link powerline adapter PA9020 for several months. One day, for no apparent reason, it began dropping internet connection; connected for a few seconds then disconnected for a few seconds, then repeat.
I tried updating all network adapter drivers on the HP, but on each one I received the message "The best drivers for you device are already installed"
Tried adjusting power and screen settings; this made no difference.
During this entire time, I had excellent connection on direct cable Ethernet to router.
Also, tested TP-Link powerline adapter PA9020 using two other laptops using Win7 Home Premium; they held excellent, continuous connection with PA9020 just fine.
Finally, after trying everything I could think of, I gave up and upgraded to Win10 hoping this would resolve the issue.The upgrade did not resolve the issue; still the repeating internet connect/disconnect.
However, after I upgraded to Win10, I again went into check for network adapter updates.
When I (right) clicked update driver on "Realtek PCIe FE Family Controller", it found an update and downloaded it with "Windows has successfully updated your drivers".
That fixed it. I connected back into the TP-Link powerline adapter PA9020, it connected right up, holds a solid connection and works just fine.
I hope this helps.