Intermittent connection issues loading/changing site- secure connection failed/site can't be reached

[EDIflyer]

Is anyone else occasionally getting a 'connection down' error from Chrome (or 'Secure Connection Failed' from Firefox) when changing page - if I hit refresh it works fine. At first I wondered if it was the site I was using but have noticed it on multiple different major websites over the past couple of months and not noticed it from other locations where I don't use Three Broadband so does seem to be related to the router/connection (this is via wired Ethernet too, so not a WiFi problem).  I've tried changing DNS server in case that helps but no difference.

It mainly seems to happen when trying to first load a site or (annoyingly) at checkout when a different site is being loaded as part of the checkout process.  It certainly doesn't happen everytime but does happen with reasonable frequency.  I've also noticed I often get it when trying to pull/push from/to Github too and have to do so a number of times for it to work (browsing the Github website works fine).

I'm using a NR5103E with Firmware Version V1.00(ACBJ.0)b14 - I tried rebooting it but to no effect.

[Nameless]

A check-in

I have not seen any changes so far

How are things for you all?

[andym00]

Still broken here, nothing changed at all.. Living with ~100Mbps over 4G is starting to grate really badly for work stuff..

[EDIflyer]

Zero change here, just as bad as ever - can get round it with a VPN on PC but still issues for other devices like TVs where I keep having to reload apps to get them to work.

[torz77]

Just checking in to say, no change here. Issue still persists.

Lets hope 2025 can be the year that Three finally solve the issue.

[AlSeek]

A question for those who have a Three SIM and also are using a mobile virtual network operator (MVNO) on Three's network...
Any MVNOs on Three's network not experiencing this issue?

[Nameless]

As far as I have tested, all Three MVNOs have this issue - You can test each one by changing the APN details and that is what I do when I test things

[Nameless]

Just a quick check-in

I moved the router and tested both Wi-Fi and Ethernet and the problem is still there although it took longer to see it as I have been connected to Band B1 lately despite all bands being enabled

Usually, if I am connected to Band B3, I encounter the PR_END_OF_FILE_ERROR at some point whilst going through the list of problematic sites once. Today I went through the list twice in immediate succession then started a round of speed tests for ~15 minutes due to the router's new position being closer to the nearest mast by ~3m-5m. After that, I encountered the problem when going through the list for a third time

The router's last uptime was ~51 days if I read it correctly before turning it off

How are things for all of you?

[AlSeek]

More or less the same as usual for me. As mentioned long ago in this thread, I am running my router as 4G only and get the connection issue infrequently. In 5G mode I get the error frequently. So that may be band related or maybe not, I don't know.
I have tried going on 5G and disabling band B3 which made no difference to me since I still got the error quickly.
Indeed connected by 4G right now I'm apparently on bands B3,B32,B1 and the issue is currently infrequent.

[Nameless]

The error is definitely somewhere in Three's infrastructure although I have not tested any of the 4G bands alone as extensively as I have tested them in combination with the N78 5G band

Have you tried the 4G bands individually? It would probably have the biggest impact on your speeds compared to using a VPN or Cloudflare's WARP although these are currently the only known methods of avoiding the highly variable PR_END_OF_FILE_ERROR completely

I will try testing the 4G bands individually when I get time

[EDIflyer]

Did anyone else have major issues last night? I found from about midnight until 9am my internet was completely down unless I used a VPN.  Phone showing an exclamation mark over wifi and 'offline' in Chrome, PC wouldn't connect to any site. However once VPN activated then all working OK - it was like a more extreme version of this issue!