Indeed, it is the ISP router.
However, from the settings as you can see from my screenshot there is a toggle button to switch it on and off...
https://live.staticflickr.com/65535/55459463962_fb47...
Unlike all the other ISPs that I had from Sky, Plusnet, TalkTalk, BT, etc under both FTTC and ADSL2+ they didn't have the toggle button to disable Automatic Firmware. Naturally of-course a firmware upgrade was more obvious. But as always, those ISPs never notify their customers when they will update their routers. It is random and it happens at night.
But under Community Fibre, they use the official Linksys routers but these original Retail versions have been modified using Community Fibre software branding. So, despite the toggle button being there, it is superficial and has no effect as they have full control to bypass this toggle switch.
The old Linksys MX4200 for Community Fibre can be reflashed using the original official retail firmware software version! That opens the way to use it for other ISPs and gives the option to now disable the firmware without it being auto-updated.
This is the router Community Fibre Supplied
https://support.linksys.com/kb/article/8606-en/?sect...
If the Linksys SPNM60CF Pinnacle 2.0 Mesh Router has an official firmware I could then potentially reflash it.
I have no problem with updating the firmware, I just want to be able to have complete control over it and do it when I want to! That's one reason I use Windows 10 LTSC Enterprise 21H2 as this gives me the option to manually update Windows without Microsoft automatically updating Windows. And if I want to install security updates, I can always do it when I want to.
The toggle switch button is deceiving and may make the customer think the connection dropped out due to network outage or router fault. Albeit, this was only for a couple of minutes and at least I was aware of it as the number was changed. But for less technically informed users they won't know and will blame the ISP for being unreliable.