Any of my sonos products wont connect

I have two sonos play 5 and three sonos play 1. None of these connect anymore, not to WiFi, not with ethernet cable. Have reset all speakers, routers, deleted system, different devices, reinstall app... The app finds the devices, but if i try to add them it eventually says to ensure that the power is on, and aborts the process. What to do?  Connecting these "easy install" devices has stolen hours of my life also before, but now i hit a wall.