My listening hit the skids for a couple of weeks, there. I opened up my streamer one day, and watched about 2000 of the roughly 2250 albums in my library up and deleted themselves. Took about 30 seconds.
Emailed Qobuz support. They were no help whatsoever. But I just opened it up again, and watched all 2000 of those albums re-add themselves to my library. All's well that ends well, I guess, but on the whole, I'd just as soon it hadn't happened.