I will chime in here. We install professional WiFi managed systems into homes and do see pretty much all the WiFi brands mentioned. I'll reserve comment as generally environmental circumstances come into play with home WiFi solutions including the adaptor, internet latency and the speed of the TV's processor. Though I will say when you have a problem and you can't actually see what happens at the network layer there is a fair amount of guesswork on the root cause.
From what we have seen on LG TV's is interesting and relevant here. Most including C7 panels struggle to connect to Ethernet at 1GB full duplex. When they do their throughput rivals a sluggish 100Mb Ethernet adaptor. Wi-Fi is not strictly AC or even N speeds either. Sony's TV's by way of example do not have the same problems.
So how do we resolve this? Answering my own question, we force the Ethernet adaptors to 1GB / half duplex where we see a connection that requires it or we may remove the slower connection WiFi speeds one by one. Others we have set Ethernet adaptors at 100Mb full duplex... Or we bypass it all, so a lot of options that home users may not have access to. I have my suspicion on what is going on but at this stage there is no straight answer.
When doing the bypass option we suggest an Apple TV or Foxtel (Sky here) so that internet service to the panel or TV is then just used for updates. Not a great answer here.
Just some thoughts.
Oh and I am happy to test an Eclipse's WiFi and Ethernet port to put some clarity around this, should it be possible as I am in Australia and I am not quite ready to install one myself.
Beoaus.