Might just be the new room acoustics are different. 
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I tried those adapters over the mains once into out new extension.
Absolutely appalling, could never get it to work properly using Wi-Fi.
In the end, used BT Wi-Fi extenders, which worked better.
Recently changed to a full fibre Mesh system with three extra Nodes which has given great coverage throughout the house.
However, have connected these via Ethernet so the Wi-Fi is now extremely stable, but also hardwired to as many components, via switches, as possible.
DG…
Yep. Awful things. A quick and easy solution (when they work) but a lot of downsides from an RF interference point of view 
Its a type of galvanic isolator.
Each of your ethernet device RJ45 ports have them, Atom, broadband hub, NAS, computer, LAN switch (if you have one)
Now your Atom has x2
A 5 metre connection between my NDS and ER switch was, until recently, routed via a similar ethernet wall socket with internal wiring of dubious quality.
In a moment of extreme tweakery, I decided a direct connection (i.e single BJ Cat 6 cable from switch to streamer) was needed.
This did provide an uplift in SQ, but also required drilling through one wall and one floor, and I now have ethernet cable running along a bathroom ceiling. So possibly not one for the faint hearted.
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Better safe than sorry 
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Similar to me.
Ended drilling a number of holes through the walls above the skirting boards.
Either used PVC trunking to hide the cable or cable cleated it to the skirting board.
Once it’s been there a while, it just blends in and stops you seeing it.
However, the the improvement in SQ, speed and reliability is well worth it.
DG…
First of all thanks everybody for the support!
@Innocent_Bystander 2 of 4 ethernet cables are inside the walls. I’ve been thinking about the switch as well, but it’s brand new and won’t change it right now. I agree with your general analysis by the way.
My switch is a TP Link TL-SG3424P. The cable between the NDX2 and the ethernet wall socket (sorry I used the wrong word @james_n. @robert_h the photo you posted is indeed what I’m using right now) is a 10m Chord C-Stream. Others are 6-8m shielded Cat 6 cables (hopefully decent ones).
@Darkebear thanks for the suggestion, I think I might be able to find a little switch to try that out. According to what you say, also a good cable from the ethernet wall socket to the NDX2 could do the job, am I wrong?
@graham55 poor me with all thesee issues. By the way the old LAN did nothing wrong, I moved to another house so I had no choice.
@robert_h I’ve been struggling with my new room (see New room and lack of bass - #38 by Blacknote) but now everything is decently optimized, even though I’m trying to understand if it’s possible to do more. I started noticing this LAN problem after I optimized most things. The computer and NDX2 are connected to the internet, the router is connected to the TP Link switch.
@afgverhart Interesting tool, thanks! I’d be curious to try that out too.
@Skeptikal I’m pretty sure this isn’t due to the different acoustics thanks to the extensive tests I’ve done so far.
Somebody might be happy, I changed the title of my post
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Wall sockets can be a real problem when not correctly installed.
I rewired a friends house a while back & couldn’t believe how bad the original wall socket wiring was, cable sleeves cut back numbers of inches with the wire pairs untwisted & hanging loose.
I suspect the CAT5 was performing like Cat2
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If you are using Ethernet Over Powerline (EoP) try a different method. EoP cannot handle a lot of data as I found out. I found it acceptable when listening to radio stations or CD rips, any high resolution music just failed. WiFi isn’t that much better either. Cat 6 wiring through out the house would be my recomendation.
@Mike-B I hope my wiring is, let’s say, ok at least…
@djh1697 I’m not using EoP, just a conventional LAN with Cat 6 ethernet cables.
I would always hardwire with Cat5e or Cat6 if you can. Even if that means running cables outside the building.
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Have you tried streaming over WiFi if that’s an option?
Last year I tried Wi-Fi streaming, I must say I was surprised by the quality, but I’m a bit “allergic” to Wi-FI and I prefer to use good old cables all the time. Everything usually works so much better in my opinion.
Except when it doesn’t… 
(Sorry)
It’s interesting that people seem to shun WiFi and instead spend £100s, even £1000s on expensive switches and cables etc to eliminate noise or whatever without trying WiFi.
When I has a 272 I did try WiFi and struggled to tell a difference but kept a cabled solution due to dropouts, probably because the 272 had old tech WiFi capabilities. I don’t have WiFi capability on my existing setup so can’t compare.
The merits of wired over WiFi has probably been addressed on here before, so I’ll take a look sometime.
Apologies for the thread drift
Wi-fi has the advantage of complete galvanic isolation from preceding network and broadband supply BUT if your wi-fi and stereo are fighting for bandwidth then clearly it wont work very well, being noisy, error prone and subject to random dropouts.
In my system, wi-fi outperforms a direct cable link by a substantial margin, but the particular wi-fi band is only handling music related data.
Sound Quality of music over networks is all about optimum set-up, like everything else hi-fi related.
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@AndyR I can’t argue with that
Nothing to worry about in my opinion. I think it’s a matter of preferences and it’s interesting to compare different ideas and solutions. By the way I still prefer the audio quality using cables, but I admit I was surprised by the Wi-Fi quality.
@Blackmorec I’m not sure it will help, but you gave me the idea to try port forwarding (if it’s called this way) on my managed switch, maybe it can help to create a specific path through cables and reduce noise even a little bit.
A sensible strategy. Wi-Fi has its place and frees us from cables but bandwidth and potential for interference considerations mean that wired is best.
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