My speedtest results. Download Speed: 227 Mbps (28.375 MB/sec transfer rate) Upload Speed: 215 Mbps (26.875 MB/sec transfer rate)

Are your cable modem and router plugged into pass-thru power socket ? Another quick way to verify is to plug the two powerline side by side and test.

Have your tried another network cable?

If your TL-WR941ND do not have a wireless on/off switch at the back, you probably need to do Google how to DIY some form of shield or faraday cage over the antenna/router.

I have 5 units of AV1200 powerline adapters running. The 1st week of January 2017, the furthest 2 units stop working with middle "Powerline" LED turning red / orange. I did a reset for both but they...

Try to reset and re-pair the powerline adapters again.