ethernet over power

Hello I was wondering if anyone could help. I am planning to re wire the network cables and trying to future proof as well. I was wondering whether there is any difference between cat6 and cat6a cables. Also reading on the internet, users have commented that cat7 is a pain to install and if...

Title explains most of it! Swapped out two old halogen floodlights (500w) with LED lights (50w). Nothing fancy needed with the electrics. Since installing, my normally reliable ethernet over power plugs (Devolo) are dropping signal almost continuously when the external lights go on (I first...