I have three laptops, a Sony Xperia TX android phone, and a Nexus 7 that all work very well connected to any of the APs.
I also have a Motorola RAZR HD(Rogers) that works fine when connected to the cablemodem's AP, but not the powerline APs. The behavior is weird. This phone shows a strong connection to the wireless network that never cuts out, but there is extremely high packet loss. I've tested with both powerline APs separately. I get the same results.
I have made sure that the TP-Link devices all have the latest firmware. The problematic phone has been tested with the latest stock rom, Cyanogenmod 10.2 and 11. I have tried radio firmwares from different retailers and stock versions. My understanding is that current cyanogenmods come with and install the latest radio firmwares.
I contacted TP-Link. They confirmed that I am using the latest possible firmware but insisted that this is a problem with my phone.
How can I further diagnose this issue? It seems weird that the phone appears to have a good wireless connection, but network traffic has problems.