I will go through what has happened and what I have done first and then at the end ask my question(s).
I have moved away from the Smart Hub due to my one doesn't work with IPv6, so I brought a FRITZ!Box 4040 Router.
This is to be connected to my ONT via WAN and has been working fine for a few days.
Then a couple of days ago I started getting about 10% packet loss around every 6 hours.
So it spikes just before 4am, just before 10am, just after 4pm and just after 10pm, I have absolutely no clue what is causing it.
Here is an image where you can see it spiking, the latency spike on the right was me doing a speed test.
The only thing that has changed from when it was all fine was the Dynamic IP, maybe that IP had some issues.
After speaking to BT Care via Twitter I a full reboot of the router and disabled the old BQM and setup a new one with the new IP and left it going which is shown here.
The latency spike on the left was me doing a speed test and the packet loss spikes was me changing some setting which for some reason dropped the connection.
Now the stupid part:
Sadly due to viewing the wrong BQM Graph I thought it was still doing it, so I did another reboot, sadly I got a new IP, so had to go through the same process with the BQM
So now the third BQM in my Sig, that little red spike was me locking down the router to allow just ICMP (Stealth Mode)
*** Question(s) ***
So my question, what would cause those packet loss spikes at the same times?
I am on an Infinity 4 connection where absolutely everything is over fibre, so am I correct it was an issue BT's end to do with that IP I was given for those two days that I was having the issue?
I ask this due to all the other IPs that I have been given on this router have not had any packet loss.
I have made a note of that offending IP so if I get it again in the future I will just reboot the router and get another IP.