The extender and the streamer are connected by an Ethernet cord.
Understood, but are you able to test the strength and lag on the extender? That WiFi (from router to extender) is the weak link in your network and could easily be causing Qobuz to get hung up. It may be hard to solve unless you can put another access point/mesh node in between the router and what you’re calling an extender (presumably it is a mesh node itself?), unless you can get Ethernet or fiber optic cable from the router directly to your streamer (or to a switch that you can hard wire the streamer too. (Personally, i am a big fan of running fiber from your router (ether with a router that has an SFP port or via a fiber media converter) to your streamer (with a FMC and SFP transducer just before the streamer). Because fiber is so thin and flexible, you may be able to run it great lengths in your home in all but invisible ways (e.g., up in the ceiling, down behind walls, along base boards, etc.) Also fiber has the advantage of no EMI, WiFi or radio interference. Good Corning glass fiber is still very cheap compared to even BJC Ethernet, never mind the fancy audiophile versions.