App seems OK now my Velop 3 pack system is finally up and running. Initially the App could not find the child nodes, even though the parent node was in the same room as the child nodes and my phone. Infuriating! I spent over an hour on chat support, then 2 hours on the phone to technical! Complete waste of my afternoon. Had to use a P.C to setup the system in the end and was told not to use the App. Horrible experience overall but has been stable for 2 days now so fingers crossed.