I experince several times a day significant speed degradation over TL-WPA9610-KIT.
Incoming channels is ~60Mbps (checked with https://www.speedtest.net/ and direct wired connection to the router). Network card negogiation speed is 1Gbps.
tpPLC shows that data rate between TL-WPA9610 and TL-PA9020 from 230 to 370 Mbps.
After several hours without any active electronic devices (as vacuum cleaner etc) internet speed (both wired and wifi on 2.5GHz and 5GHz) becomes ~1Mbps and keeps it for a long time (at least 30 minutes).
In the meanwhile - according to tpPLC data rate between TL-WPA9610 and TL-PA9020 is > 200Mbps and direct wired connection to router shows incoming channel is still 60Mbps.
After physical plug off and plug in TL-WPA9610 in 1-2 minutes, speed (both wifi and wired) becomes back ~60 Mbps (+- 2Mbps).
I understand that speed could degradate if there is some active electronic device (like vacuum cleaner or other engines) that could produce noise on electrical circut but I expect that powerline adapter has to recover after that in some reasonable time (up to 1-5 minutes sounds reasonable).
The fact I experienced speed degradation in a night time (after 11pm) when electricity consumption is close to zero (even unplugged frige for that) - checked all speeds with a direct wired connection - but the only workaround so far is to unplug and plug in device again.