Struggling to work out what the issue is here - cable, networking card or EE SH router?

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It doesn’t matter which port the cable is plugged into. Laptop on its own is fine (only real difference is the Intel NIC/card). I will try the replacement cable that’s coming, but it’s happening when tethering on 5G as well

Looking online (and ignoring the PCs issues atm, I need to look into those separately), there are some other reports of disconnections with this SH+ that are a bit odd

 

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So I plugged in a cheap long cable and that seems fine/better

Hurts to have to be considering replacing the cable (it's expensive for me).

 

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Cable works fine on a laptop and an Xbox - so suspecting something weird is going on with PC. I may still get a cable tester but don’t think that’s the fault anymore.

WiFi devices seem to have improved a bit after I changed the setting from WiFi 6 to 5.

 

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Going to sound utterly stupid but I don't suppose you have a landline? I made the mistake of having a dect phone close to a PC once, and it played havoc with the Ethernet.

No, no suggestion is a stupid one!

I don’t have a landline that’s in active use, and it’s nowhere near the PC anyhow.

I’m strongly suspicious of the PC, despite the fact it’s had a replacement motherboard (unfortunately like-for-like) - when this issue happens it seems to lose the connection completely (no network activity in Task Manager). I’ve replaced the router with an Archer AX23 now, so that rules that out.

Just wish I hadn’t paid £100 for a stupid IT tech who was basically no use at all to come out and look at it.

 

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No space for PCiE one, but I tested an external Realtek one (built in is also Realtek) and that had the same problem. It’s about 15 metres and I’ve turned off every power saving/green setting I’ve found related to Ethernet. The cable is fine with other devices (I’ve tried an Xbox and my laptop) and also ran another one up there

I really don’t suspect the PSU of the PC myself - surely I’d be seeing more problems than that if it was (eg power issue, crashes when under high load) though I’m not that techie from that perspective either!

 

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Have you tried it with all other devices disconnected and WiFi off?

Yes. It persists

 

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I've found a USB Ethernet adapter that should use a different adapter chip, so will test that when it arrives tomorrow.

 

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Hi,

Reddit was reporting the internet had lost connection, and my Wireshark reported it lost my Eth port.

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To be quite honest, I'm not sure what to take screenshots of (I've never done it)

Taken a few screenshots: https://imgur.com/a/KYSf552

I'm thinking the PC has some kind of fault, given the other devices are fine, but honestly have no idea what it could be (tried mobo replacement under warranty, external NICs). Previous PC was fine (using WiFi at the time, obviously, but this has the issue on WiFi, 5G and Eth)

TPLink router doesn't detect that my PC disconnected.

 

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Hm.

So I also tried a Ubuntu live USB and the issue persisted there.

 

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Have you tried this?

Yes., I have.

 

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Sadly not the cable

I’ve had the other cable in the PC, same problem happens

 

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So my PC is definitely still randomly disconnecting itself (showing a connection but not actually working when it happens)

 

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Been using my M1 Mac today and that's fine

Looks like the company I bought the PC from are going to be terrible in regards to getting the money back (or what I can get back). I can only hope it's not too long.

 

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Did you try a different network card? Even a USB adapter is worth a punt.

Yes - I’ve tried two different external NICs

 

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Is it under warranty? Presumably it'll be a mobo swap?

I’m hoping it just needs a different board now (but this one’s already been replaced like for like, so I’m just a bit stumped as to whether that can be the issue still)

Company is also proving very difficult to get to do things.

 

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BIOS is on the most up-to-date version

 

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Hard to say much more really especially if the same cable run works fine with other devices. With the board being swapped, I seriously wonder if it could be a issue between chipset and ryzen soc as wireshark is detecting the NIC dropping out not cable issue with that error message.
But would expect the system to have more than just Ethernet issues if that was the case so just a theory tbh..

Hmm. It certainly is difficult, although seems logical that it might have something to do with AMD (my old PC had an Intel processor and also worked fine)

 

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Company are going to replace the motherboard with a Gigabyte one. Fingers crossed.

 

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It's definitely the PC, but company are being completely useless in solving the issue (despite threatening the legal route/rejection of the PC a few times) - then I post a negative review, which gets me one response. Then silence again. This has been ongoing since last Thursday.

It's clearly not a widespread issue with B550 motherboards (otherwise there would be a lot more reports!).

Been using my M1 Mac (don't judge - it's the only alternative device I have!) and no issues for 5 days (but obviously, gaming is difficult).

Therefore I am absolutely stumped - I've tried everything software related and hardware related, short of a full PC replacement (making sure the connection into the house is OK, router to rule out the terrible EE one causing it, alternative Ethernet cable)

A question I had: Previous Intel-based PC (B760 motherboard I believe?) was fine from a networking perspective - should I aim to get a Intel motherboard if I end up getting this one "returned"? Or is it likely that any potential "incompatibility" is not with the AMD B550 Chipset itself?

Also, my understanding of this is limited at best, so may be difficult to explain what I'm asking, but will try my best:

So, built in NIC (cards?) on the mobo and the external NIC's - do they interface in the same way?

I'm just struggling to understand how my old PC (which had an ASUS Prime B760) "just worked" compared to the AMD build with a different chipset really.

 

[RT123]

It's a long shot but... have you considered the AMD fTPM bug as the cause? It was prevalent on every AMD platform and some chips are more suspectible to it than others. Plus it's Asus so you know they never actually addressed it.

Disable all security settings in the Asus BIOS. Advanced/Security > Trusted Computing > Disable

AMD fTPM Random Stuttering Example (Read Description)

Enabling the 'firmware TPM' causes system wide stuttering on a growing number of AMD based PC's, as seen in this video. Personally, I have now had 4 consecut...

www.youtube.com

Things like this would happen. I can see it under certain circumstances could knock out a network interface which would also explain why the onboard NIC and external NIC show the problem. You should think about running LatencyMon and trying to correlate any interrupts to when the interface goes down. That would give you a good idea if it is the fTPM bug.

Thank you for the suggestion, I hadn’t thought of this! (Especially since I have seen some things that could be caused by that, eg random stuttering/ ‘microfreezes’ in games)

I will give this a try at some point over the weekend!

When I did manage to speak to someone at the company (seems to honestly get like 1 thing done if I leave a negative review), they wanted to look at it from the perspective that ‘your Realtek NIC is incompatible’, but I don’t think that’s the problem, given different (admittedly external) NICs (which I also tested one of them with a different device and, it was fine) and cables with the malfunctioning PC show the same thing