I run a Cocktail audio streamer with my Naim integrated amp. Yesterday the streamer App on my iPhone stopped “seeing” the streamer. WiFi and Blue Tooth still worked on my phone for everything else.
After hours trying to sus the situation, I installed the App on my wife’s phone and on my iPad, and it worked. After cussing for a couple of hours, I disassociated the wifi connection on my phone, and re-entered the password on the phone to make a “new” connection. Bingo! The phone now sees the streamer again.
I have no idea why this was the solution. But consider trying this when phone and streamer lose contact.