I'm not very knowledgeable about what the graph means but it looks very peculiar to me. The red appears regularly at around 4pm and continues for a few hours, sometimes all night.
I have a Fritzbox 3490 on Zen VDSL (but I'm a mile from the cabinet so I only get around 6MB/s down & 0.2 up). I have a Synology nas and a desktop PC - both permanently switched on. Anything else (laptops & tablets) will only get occasional use. (email, browsing, no one plays games in our household, or streams Netflix, etc).
As you might expect, response on the laptop, etc, can be abysmal in the evening.
Can anyone suggest how I dig into this further?
Edited by filbert42 (Sun 26-May-19 21:39:20)