Every evening I'm reaching low speeds, during the day it's fine reaching between 30-40 mbps but every evening I'm lucky to get too 3mpbs. I assume there's no issue with the box as I'm reaching decent speeds during the day. I feel rather cheated! Are VM likely to help or have I just swindled for a year?
A couple of things, are you testing wired or wireless? Remember in the evenings with everyone home more people will be using 2.4ghz devices if you not using 5ghz, alway best to check wired for a speed test as there are various factors that affect wifi.
Also you mention 12 months, have you just joined VM? You have 14 day cooling off period where you can leave without penalty, if you have issues you may want to consider this?