Okay, so far no ideas at all as I see... Disappointing. What else beside new pairing of the devices could be done to ensure stable powerline connection? What are the differences between Hardware...

Model : TL-PA9020P Hardware Version : 1.0 Firmware Version : 3.2.4._902111_170118_901 ISP : Hi, I upgraded my powerline network from 2 TL-PA 8030 (worked with no failure for years) to 4 TL-PA9020P,...