topic Re: Slow broadband in Full Fibre

Re: Slow broadband

Michael16 — Fri, 03 Jul 2026 14:02:06 GMT

Very similar problem. Joined in February I think. A few weeks or months of slow service. Then after a router reset or refresh or something, great service. Now bad again the last few weeks. Doesn't matter whether I connect direct with a lan line or not. Router refresh might help but only for four hours or so, then #### again. Speeds between 50-100mbs, I'm supposed to be getting 900 with a minimum of 400.

Re: Slow broadband

jab1 — Fri, 03 Jul 2026 14:21:12 GMT

@Michael16 You should really have started your own topic on the Full Fibre board - piggy-backing, especially on an old, fixed topic, is not good practice. I have asked for your post (and this reply) to be moved.

You say a refresh/reset helps. Are you using the PN Hub2? The speeds you are reporting (between 50-100) suggest that you are connecting to the 2.4, rather than 5Ghz band.

Re: Slow broadband

Baldrick1 — Fri, 03 Jul 2026 14:26:53 GMT

Moderator's note:
Thread moved from irrelevant topic on the Broadband board

Re: Slow broadband

Michael16 — Fri, 03 Jul 2026 14:42:33 GMT

Ty. It doesn't matter which router I'm on. I had a tplink archer axe 75 plugged in when the problem started. Plusnet can't test that so I plugged theirs back in. Didn't work, then plusnet reset something and it was good for a couple of months. Set up a tplink er707, was fantastic for the first week or so. Then it went bad, and I've been using plusnet router again. It's not the wifi, these problems are coming up when devices are plugged directly into the router. Old reach engineer was here earlier (again), and he found after replacing the out box that while the wifi was great, direct lan connections to the router were the junk I'm usually getting now. Then after about 4 hours now the wifi is bad too. 2 open reach engineers in 2 weeks, same problem, no resolution.

Re: Slow broadband

Michael16 — Fri, 03 Jul 2026 14:43:23 GMT

Open reach. Old reach...

Re: Slow broadband

jab1 — Fri, 03 Jul 2026 14:53:09 GMT

I appreciate you are not happy, but please try and help us help you.

Can you please run wired a speed test on https://www.speedtest.net/ and attach the result to a reply.

It would also help us if you could attach your Hubs Status page and Technical Log - Information page, ensuring you obscure personal details.

Re: Slow broadband

PhilipHeyes — Fri, 03 Jul 2026 15:58:11 GMT

Router refresh might help but only for four hours or so, then #### again. Speeds between 50-100mbs

Reads like a network cable defect that a number of hours after the reset has accumulated

enough errors to de-rate from 1000 to 100 Mbps. Speeds then would be about 93 or less.

Re: Slow broadband

jab1 — Fri, 03 Jul 2026 15:54:04 GMT

Good thought, @PhilipHeyes Maybe if the OP comes back he could try replacing both Ethernet cables, although I'm guessing only one will be defective.

Re: Slow broadband

njay — Fri, 03 Jul 2026 15:54:59 GMT

Wondering if its the ont to router cable?

If so then next time it happens it would show up in router admin page as WAN link 100Mbs rather than 1000Mbs

Re: Slow broadband

Michael16 — Fri, 03 Jul 2026 16:07:25 GMT

Ty. These are interesting ideas. Except 2 things, the service is somewhat random. Resets help (I think sometimes, I've been doing this so much every day...), but then the speed goes down again. Network cable on my end? I'm using new cat 8 cables. The open reach engineer switched mine, and plugg in his, same results.if it's something before it gets out of the not box, that might make sense? Apologies I'm new to looking at these things this deep and very frustrated...

Re: Slow broadband

Michael16 — Fri, 03 Jul 2026 16:13:23 GMT

I've uploaded the speed test, not sure it can be seen here?

Re: Slow broadband

Michael16 — Fri, 03 Jul 2026 16:14:42 GMT

And I have screenshots as requested. But which personal details should I be worried about? ( There are no names or anything obvious)

Re: Slow broadband

jab1 — Fri, 03 Jul 2026 16:21:00 GMT

@Michael16 to attach the screenshots - click the paper-clip bottom left of the reply window and follow the prompts.

the 'personal details' you need to obscure are your username and accountname - something like 'sid@helpme.plus.com'.

Re: Slow broadband

PhilipHeyes — Fri, 03 Jul 2026 16:49:54 GMT

Can I suggest stop resetting the kit & start finding out what is going wrong.

When there is a sustained speed drop, login to the Hub/Router and check the WAN speed and the LAN speed.
if you computer is network connected check the link speed shown again is it 10/100/1000 ?

If either have dropped to 10 or 100 that is a cable problem. CAT 5e cable is perfect up to 100m at 1 Gig speeds.

CAT 8 cable might just be the issue, any kind of screened or shielded cable that is used with plastic 1 Gig sockets leaves the screen / shield floating i.e. is become an antenna collecting noise right next to the data lines.

Re: Slow broadband

jab1 — Fri, 03 Jul 2026 16:52:30 GMT

good point, @PhilipHeyes cat8 is super overkill for a domestic setup.

Re: Slow broadband

Michael16 — Sat, 04 Jul 2026 07:47:59 GMT

2 problems with the cat8 theory. This is similar or the same as the problem I had when I joined plusnet, before I was using the cat8 cables. Also, the open reach engineer yesterday replaced it with Cat5 cable, no help. Although there are probably a few other cat8 cables plugged into the router. If I'm going to go plumbing around my end I guess I will start by unplugging all cables. If I do that, will it help to power down the router and/or ont box each time? (It will just be a pain but obviously I can). Also, there is no button to add files. I assume that's because I'm on a phone this end? I will try from a laptop later. Tyvm for all the help and ideas!

Re: Slow broadband

jab1 — Sat, 04 Jul 2026 07:52:18 GMT

@Michael16 Can't really comment on the cables issue as it is slightly out of my skill-set, but to add files on a mobile device, you need to request the desktop site.

Re: Slow broadband

MisterW — Sat, 04 Jul 2026 08:04:51 GMT

@Michael16

before you go into wholesale cable swapping, as @PhilipHeyes said , check the WAN link speed shown on the router status

login to the Hub/Router and check the WAN speed and the LAN speed.
if you computer is network connected check the link speed shown again is it 10/100/1000 ?

It should always show 1000, if it doesn't then that is the problem.

It may be down to a cable fault but it could also be a connector fault on the router, we've seen one or two instances of this in the past

Does your router serial no start with 'R' ?

Re: Slow broadband

Dan_the_Van — Sat, 04 Jul 2026 08:31:01 GMT

@Michael16

Cat8 cable is very stiff, are you putting any strain on any of the Routers, LAN/WAN ports.

With the Hub Two the event log does detail port disconnections.

If you look at the event log at the exact time a device connects to the Hub you will see the connection speed, the event looks like this

hh:mm:ss, DD MMM. Wire Lan Port 3 up, Speed 1000 Mbps <- this message is the port detecting a connection and negotiated speed

hh:mm:ss, DD MMM. A device connected to Ethernet port 3 <- this message confirms the connection.

For 100 Mbps it would be

hh:mm:ss, dd mmm. Wire Lan Port 3 up, Speed 100 Mbps

These messages are not categorised so no filter can be applied to find them, these messages clear after a while so a search on the event log may not find them.

A port down message

hh:mm:ss, dd mmm. Wire Lan Port 3 down, Speed 10 Mbps <- 10 Mbps is reported as speed negotiating starts at 10 Mbps.

Port can be 1, 2, or 3

disconnecting a LAN cable

hh:mm:ss, dd mmm. A device disconnected from Ethernet port 1

hh:mm:ss, dd mmm. Wire Lan Port 1 down, Speed 10 Mbps

Re: Slow broadband

Michael16 — Sat, 04 Jul 2026 15:30:53 GMT

phone speed vs laptop both on wifi