Nice share!

did you set time limits or bed time etc.? I guess it is the settings issue, here is an instruction for your reference: https://www.tp-link.com/us/faq-1598.html

If you still keep the virgin media router, the main deco should be set to AP mode, and it is recommended to turn off WiFi on your first router, hope it helps!

yes, 3 phase will lower down the speed. what is the bandwidth your ISP provided? if it is similar to 450Mbps, you won't get a speed higher than that. AV2000mpbs is just the PHY speed.

switch the adapter in the location between TV and PC. if the problem happens to the same adapter, which means that this adapter is faulty. but if it happens in the same place, which means that socket...

the link to download tpplc utility https://www.tp-link.com/us/download/TL-WPA4220KIT.html#Utility