I have been running an Auralic Aries and love the Lightning app. Super easy.  I heard the Roon App was better and wanted to check out a Lumin device for increased tonality. So I took the plunge and the interface is not working well.  
Here are my system details. 
I use an iPhone and apps for Lumin and Roon. 
Now have the Lumin U1 Mini.  
The Lumin app alone is bad. 
Roon:  running a core on my macboook. 
Roon app on iPhone. 
Issue:  app connectivity sucks. What can I do to improve it?  Am I missing something?  It almost always says lost connection on the iPhone and even when it says it connected it doesn’t work.   
Thanks!  Cant find this info anywhere.