I also meet this problem, and I find a FAQ related to this problem. It help me solve this problem, please refer to the link following. http://www.tplink.com/en/faq-884.html

I have used the SwitchPowerSaveTool before, it really support all of TP Link's PLC device. I use this tool disable my device's power save function, it's really useful. However, it only work normally...

Because the data transfer between two PLC device via powerline, so it doesnt support "Jumbo Frames" now. However, the individual device transfer the data doesn't via powerline, so it's no problme

Firstly, TL-WPA281's hardware version only has V1, you can check it in the following link: http://www.tp-link.com/en/products/details/?categoryid=&model=TL-WPA281#down Please reset your TL-WPA281 and...

The rate is just a connection rate which shows in the utility, if the connection rate is 337Mbps, the actual data transfer rate is about 160Mbps.(The rate transformation ratio is 48.05%)

Please go to the following link and download "SwitchPowerSaveTool", you can use it disable your device's power save mode. http://www.tp-link.com/en/support/download/?model=TL-PA511&version=V1#tbl_b