Yes exactly this behaviour. Disappearing Expert Pro and when it does appear drop outs in play. See posts in the the other Expert Pro thread : I absolutely confirm this issue. 440 Pro fed by Nucleus+ and ethernet. At 1000 mbps unstable dropouts. I installed a cheap (7€) 100 mbps switch to feed the 440. All problems solved. Clearly an issue for Devialet here. I wish that Devialet software capability matched their undoubted hardware prowess.
Poor release practices on The Devialet side. Otherwise happy with Roon .