Right, so I’ve tried a workaround and I’ve come to the conclusion that Bluesound either doesn’t know or doesn’t care about WiFi execution.
I have a pair of Flex 2i which kept dropping from Roon within a track or two. Basically unlistenable and which Bluesound showed zero interest in helping, in spite of one of them having an actual manufacturing fault initially (luckily the retailer was more understanding).
Anyway, after months of intermittently trying to get things working and hoping each firmware update might solve things but to no avail. This forum is littered with similar issues.
Being curious (and wondering if Bluesound themselves might be at least partly right) I bought a cheap wireless extender to improve the signal. Now I had great signal (original signal was already -58dBm so shouldn’t have been a problem) but still had issues. However the booster was now close enough to one of the speakers to attach a network cable. I connected it and, miraculously, that speaker was solid as a rock, while the other speaker continued to drop from Roon (but not from the network).
Another cheap wireless extender later, connected via ethernet to the second speaker, and voila - the two speakers have been operating with Roon in a stereo pair for an hour without a single hiccup.
Now this is working for me, but it’s cost me another £60 ON TOP of what is an already very expensive set of speakers (when compared to Sonos etc). In theory, I was prepared to pay more than Sonos for the extra functionality of the Bluesound. In practice, I own an inferior product with an untidy workaround and another two devices now drawing power in my home. Great.
After all this hassle, I am somewhat relieved to actually have things working. But ultimately, this is not acceptable.
I would strongly urge anyone considering a Bluesound product to look elsewhere. You have a strong likelihood of receiving a defective product and you will be blamed for it yourself. Seriously - just buy something else.