Ok now I am frustrated with streaming

So happy to read this post.  I thought nearly everyone had gone to streaming.
Its good to read so many see (or hear) that CDs are still most often better sounding.

There are so many half thoughts and disconnected opinions here as to confuse anyone. A fw comments:
1. if your wifi sounds better than Ethernet, you have a problem2. A high res video stream is 3-10 mbps; streaming FLAC music is ~ 0.7 mbps.  so 230 mbps is crazy overkill.3. But what raet are you getting from the music servers? They are affected by many network issues, principal among them peering (dont ask, its techo-legal)4. first trouble isolate. Does it exist with CD? Phono? Etc.5. If its streaming only, ping TIDAL or ??? and get some data6. opinions and raw "on the tin" numbers w/r/t network performance are so much gibberish. Your internet can be fast, yet a server or intermediate point congested.  if so tho, the situation should vary from good to bad day by day7. No magic box will fix. Either you have a misbehaving component that needs repair, or a system problem that needs troubleshooting.
I have never had overt distortion from a streaming service whether low res or high.
Should you discover that you have inconsistent networking, and if you can set your buggers as large as possible.
Good luck. Be step by step logical.
G

to RVpiano - i play both back to back and on my system vastly prefer streaming to physical CDs - typically from my server but also from Tidal/etc. I rip all my CDs ALAC and play on either Mac with Bitperfect and upsampling, or ROON on  dedicated 4-core ROCK.G

I am running a brand new Asus AC3100 router and it has a few ports

One thing I would do (if you haven't already) is check for firmware updates to your Asus.  New wireless routers are shipped all the time with immature firmware which eventually gets fixed.  New firmware has fixed network latency issues (and more serious issues) in the past.  Whether this fixes your issue or not it's a good idea to check from a security standpoint.

I used to do corporate networks starting 30 years ago and their could be a few things that you should look at:
1) you indicated that xfinity saw some errors. What were they? Could they fix them or did they mask them by upping your speed? Speed isn’t the problem, it’s the quality of your connection.
2) something simple to look at 1st on your side is you could have a bad Ethernet patch cable. We used to certify every cable that we made to ensure it was built right. Invest in a cheap network cable analyzer like the Tripp-lite network cable tester for $40 and check each of your cables. You would be surprised how many cables have issues
2) Router configuration. How many routers are you using? Do you have a bridged network or a mesh network? If you are using a few routers, are they attached by an Ethernet cable or from WiFi? Big difference in performance, you don’t want to use WiFi unless you have to.
3) you want to use a 1G internal network which requires cat5e cables or higher. I use a cat7 audioquest Ethernet cable from my wall socket to my dac, much better termination which equals better sq. 
I have been streaming (to me streaming is accessing music on a disk drive or internet) for over a dozen years without any issues. My music server is a Mac mini running Roon from a different room than my audio equipment. I have been thru many years using pure music/Audirvana  software or a dedicated music server Auralic Aries. Roon replaced all of that.

Network wise, I have a 1G private network and my house is all wired using cat6 cablIng. My internet is a 1G fiber network. My last house I had 1G fiber using cat5e cables without any issues. Even with my home wired in every room going to a 1G switch, I use 3 routers all connected together with cat6 cabling. All 3 routers are setup in a bridged configuration. Any Mac that is attached to any router will see 950Mb upload and download speeds with 3 or 4 ms latency. Tidal MQA is every bit as good and usually much better sound quality than ripped or purchased hires files as well as vinyl.