When the problem started, the amp ZP100 was not visible in the Sonos app, the light was solid white, but very dim. I reset it to the factory settings and added to system again. After the factory reset I can see the ZP100 in the application but the player has poor range of "wifi" (Sonos wireless). The white light is still dim. If I have the ZP100 in next room it dosn't work (not visible in the system). In the same room it works, but I don't need two players in the same room.