I am having a problem that seems somewhat similar. After months of successful use, Roon app running on 5 year old iPad connects to Nucleus+ across network (with router and switch) and Chord M Scaler endpoint, with 2 networked Audio Sources. But, then recently, cannot establish connection to the M Scaler. I have done some troubleshooting and consulted with my dealer. May open a case here, soon. Thanks.