Your problem may be caused by the wireless interference. You can try to change the wireless channel of your WPA281.

Powerline communication is definitely point to multiple points communication. I have to say your problem is so strange as I haven't received similar problem feedback from other customers before....

You can download the utility from TP-LINK official website. Here is the link for TL-WPA271: http://www.tp-link.com/en/support/download/?model=TL-WPA271&version=V1#tbl_j Here is the link for TL-PA211...

You can use the pair buttons to make TP-LINK and D-Link Powerline adapters work together. This link will help you to some degree:...

This link will help you understand how to configure TP-LINK Powerline adapters: http://forum.tp-link.com/showthread.php?75985-How-to-build-a-secured-powerline-network&region=china

TL-WPA4220 is not like range extender product. It is like wired Powerline adapters. The only difference is WPA4220 can also offer wireless network apart from wired connection. So you need two...