Big issue with my fiber optics internet for Qobuz streaming

@djohnson54  I am doing exactly what you seem to be about to try.  I have an ATT BGW320 (which you have to use because the ONT is built-in - AT&T doesn’t provide a separate ONT).  Since I already had my own Asus mesh system (XT8), I set the BGW320 to passthru and turned off 2.4 and 5 transmitters.  This avoids the problems of double NATing and additional congestion on the networks you actually want to use (Netgear).  I have not modified the MTU setting for either router.  I stream Qobuz without problems.

Yes, this is exactly what I’ve just done. I’ve been playing 24/192 over Wi-Fi for the past almost 3 hours along with 3 other video content streaming for testing purpose, and the issues are gone. @djohnson54 and AI got it completely right. I haven’t changed the DNS or MTU either.

That said, even aside from speed considerations, changing the DNS may still improve security by using one or two of the recommended options from @erik_squires or AI.  Note that the DNS needs to be changed on the new router side, not on the modem per ChatGPT.

Thank you @cleeds, @foggyus91, @tuberist, and @djohnson54 — and also ChatGPT, who provided a 100% accurate and to-the-point solution. I’m really happy to have resolved this annoying issue in such a short time.

@lanx0003 Very little information here to go on. Do you use WiFi? What are you using as a streamer? If you use play.qobuz.com on a web browser do you have errors? What do the log files tell you on the router? Cheers.

I had a similar issue in the past with the way AT&T implements TV over fiber. The solution is to implement VLANs (essentially virtual separate networks). You will need a managed switch to implement. Put the TV and streamer on separate VLANs. The other solution may be to drop AT&T TV and use YouTube TV or similar.

If you happen to use Roon and have ANY wireless activity in your home related to using it- like controlling it from your phone or Ipad or laptop and if as part of your new fiber system the provider has installed various Wi Fi devices- like an Eero router and additional Eero devices that wirelessly extend wi fi in your home then the problem is almost related to the Eero system and its constant steering of signals across two or three bands it employs. So, your phone may be trying to talk to your Roon device via a 2.3g band while the roon device is operating on your 5g band. I've had years of this frustration and eventually went to wired use trying to get all devices on a hard wired network. Still, at times when streaming I'll have freezing / hangups. 

I'm not currently streaming using QUOBUZ, but I can attest to AT&T being generally awful. Luckily, AT&T doesn't offer fiber in my area.

I switched to T-Mobile fiber and couldn't be happier. 2 Gig on ethernet and 900 mbps on WIFI. Far better WIFI coverage in my challenging MCM, aluminum clad house. I do stream Hi Rez files on Amazon through the the provided NOKIA  server/router without issue. I know I'm not utilizing ultimate quality like QOBUZ or Tidal, but the T-Mobile system is fantastic.