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.

[EDIflyer]

Sadly no change here, still lots of errors to Github this evening unless I use a VPN.

[applepieman]

This issue has now been live for over a month can someone please explain what progress or discoveries have been made. I have some very annoying issues attached to this problem and so far this is hardly stellar service for paying customers. 

[tucu]

I've switched the APN today to Manual mode and entered three.co.uk instead of 3internet. It's been 30 mins so far, and I've not encountered the issue again. Can anybody give that a try and report back please?

ps - speed is slower. there's more details from @JonathanB on this here: https://community.three.co.uk/t5/Network/Three-APN-Settings/m-p/5373

[EDIflyer]

I tried this previously but sadly it didn't solve the issue for me. 

[AlSeek]

I've given this a go, switched back to 5G and manual APN of three.co.uk but soon experienced the issue on some of my usual websites so hasn't made any difference for me.

[kris]

Same thing.

Error code: PR_END_OF_FILE_ERROR all the time!

I had ZYXEL NR5103E and switched recently to HUAWEI H112-370 (5G CPE PRO) - no change at all, exactly same behaviour, so 100% it's THREE fault. I'm in full 5G signal.

God it's so annoying when it drops the first connection on the browsers. It also does it to my TV EPG so sometimes I have to refresh it few times to get programme list!

[JonathanB]

Hey @kris,

Thanks for confirming that this is an issue with the Huawei device too. It seems like it's mainly a 5G issue, some users have found 4G is connecting without this error, with a couple of exceptions, but it seems to vary between different sites. We've gathered some example account details, and I'm passing on any community feedback to help with the investigation though, so hopefully this shouldn't take too much longer to resolve.

Thanks,
Jonathan

[AlSeek]

I had switched to using a 4G connection the last 3 weeks after it was mentioned by @Tatablack this does not exhibit the connection issues (although I wouldn't consider it a solution as the speeds are slower) and my experience is that the issue doesn't occur on 4G EXCEPT the last week I have repeatedly experienced the issue when navigating to Wikipedia only. Nothing else just Wikipedia. So the hypothesis that it is only 5G affected doesn't seem wholly true, although on 5G it is many many websites affected whereas 4G I've only experienced this one website affected. I hope it doesn't get any worse on 4G.

[Tatablack]

I can confirm. I switched to 4G tonight because I needed my GitHub connections to be reliable (now they are), but indeed I still have problems with Wikipedia or malkoffdevices.com. Puzzling.

[JonathanB]

Hi @Tatablack,

Thanks for confirming this. It seems like the issue must be a complex one but hopefully this will help the team unravel it.

Thanks,
Jonathan