Your network SPEED looks just fine (audio only needs 10 mbps or so to work).
However, when it comes to streaming, there are other things involved besides speed.
Neither the type of networking use don the Internet, nor the Ethernet networking in your house, was originally designed for "a steady continuous signal".
What this means is that, regardless of how fast the service connection is, it may still stop for a split second every now and then (or even as long as a few seconds).
This is normal, expected, and unavoidable.
In fact, on both the Internet and your home network, it is even expected that occasionally packets will be lost or corrupted and will have to be re-sent.
And all of this is worse with WiFi... which can also suffer from radio interference.
The way we keep this from causing problems is to use a connection that is far faster than we actually need and provide buffering in the player device.
So, when the connection stops for a short time, the device has enough data stored up to carry it over the gap, and can refill the buffer quickly enough when the flow resumes.
But, with some devices, the buffer isn't big enough, or the device may not operate perfectly smoothly when switching back and forth.
In a home network there is also essentially no protection against the network being swamped by heavy traffic.
And, if one device on the network decides to download a huge update, it may monopolize your entire network for a brief period, and block all other traffic.
(Think of how your shower gets cold for a split second when someone else turns on the hot water.)
I've heard very brief dropouts on the audio cable TV shows when downloading a very large file... because both share bandwidth in the same "network pipe" - and I have 600 mbps service.
(There are "protections", forms of QoS, that do attempt to "protect" TV, phone, and Internet service bandwidth from interfering with each other, but they are not absolute.)
In a home network the general solution people pursue is to "make everything fast enough that it doesn't happen"... but this also is not absolute.
Individual devices on the network can become "overloaded" or "bogged down"...
The best solution is to segregate network traffic wherever possible.
For example, if you have a home video server, and you watch video from it on various video devices, connect that server and those devices to a dedicated switch...
Then connect that switch to your Internet router...
And, if you have several computers, connect them all to a different switch...
Then also connect that switch to your router...
That way all of the traffic between your video server and its clients goes through one switch...
While all of your file-type Internet traffic goes through a different switch...
And each only goes through your router when it absolutely must.
(And, even when you download a big file, which goes through your Internet router, it doesn't interfere with video between your server and its clients.)
Switches do their best to segregate traffic internally in this way... but aren't always entirely successful... especially small "home switches" with limited capacity.
What you describe... if the audio is actually speeding up for a brief period... suggests that it is the player software having some sort of buffer issue.
(Basically it is running out of data... hesitating for a second... then "rushing to catch up" (somewhat like when you do "fast skip forward" when playing a CD).
This is something that can happen with many streaming audio players... and is simply why streaming is not quite as reliable as an actual direct connection.
To attempt to clarify a bit about the "skips", these have happened regardless of the home streaming device - OPPO, Mac using Tidal Desktop, and TV4K. I have used wired and wireless with the OPPO, but only WiFi with the other two.
The skip sounds like the song has been speeded up briefly. Kind of like there was a mismatch of bitrate where it's being played faster but doesn't sound like Alvin & The Chipmunks, but only for a tiny fraction of a second. I would say that out of an evening of playing music for several hours and more it would happen several times.
I also notice skips when in the car where they also happen less often with Apple Music, but I forgive these due to being mobile.
edit: While I wonder if it's network related, my WiFi speed is consistently above 230Mbps. When it's slow it's about 160Mbps. The upload is always 12Mbps except for when my incoming cable wire needed a repair early this year and it was around 6Mbps upload, and the download was about 60Mbps.
This doesn't excuse the issue from being network related, but it would seem to me that it's not related to speed. What setting might be an issue? I might try Tidal for another month just to see what happens if someone can come up with a setting to try that Tidal is happier with, like Apple Music.
My router is an ASUS AC2900 RTAC86U, and the cable modem is an Arris SB8200.
