Big issue with my fiber optics internet for Qobuz streaming

This is probably a handshaking issue between Qobuz Connect and your streamer.  I have high speed reliable internet and use a ethernet cat 6a cable from router to high end streamer (Simaudio 891), and I still have this same problem.  Perhaps Qobuz can fix it.  Meanwhile, I have given up on Qobuz for now and gone back to Roon which does not have this problem.  

I have the same ATT modem/router combination that you have.  As has been suggested by others, I used IP Passthrough to take the load off the ATT device for assigning IP addresses, and other router tasks.  My router duties are performed by a Synology router instead.  Having gone this route I have had zero issues with Qobuz streaming in any quality level to my system.  So hopefully you find the same to be true.  

Also, I did not turn off the WiFi broadcasting from the ATT router, but don't have anything connected to it.  I was cautioned by ATT tech to leave some way to get into the router directly for software updates, or for the occassional need to get into the ATT device's settings (which I had to do to set up some port forwarding rules for JRiver and Roon).  I am sure everyone's setup is a bit different but this is how I dealt with it.  

Finally, I make a habit of rebooting the ATT gateway once a week, just to refresh the connection with their servers.  This solved a few other random disconnect issues I had.  I do that via the ATT app and it takes five minutes and of course distrupts network traffic while that is going on, but it's usually done early in the AM or very late at night.

@lanx0003 

I am sorry that you are having troubles with your new set up. I would start with what Audphile1 suggested then my first call would be to Qobuz to rule out server issues on their side. The storms we have had of late has affected s lot of things. I recently switched to eero and upgraded the copper where ever possible. I'm sorry I dont have a silver bullet abswer for you but I feel your pain. Upgrades should be just that; but often it can create other problems. 

Peace

I recently switched to ATT Fiber and I’m also experiencing an issue with Qobuz. It will stop mid song and move to the next track and also stop completely but it shows as still playing on the app. I have a Lumin U1 Mini streamer connected directly to my RAXE300 router. The gateway is in passthrough mode

It's AT&T.