In response to boxcarman's question, I noticed his particular problem with QC and Aurender in the showroom of a high end dealer using their very best equipment.
The problem overall in intermittent, but serious enough to interfere with the listening experience.
At home, I have a Simaudio 891. So, the newest technology. Qobuz works perfectly with Roon, but the problem persists with Qobuz connect.
It the problem of not being able to play tracks may depend on the streamer/dac. If so, Qobuz needs to identify the problem, fix it, and do a better job of certifying companies and their products and working with Qobuz connect.