I have 3 cans of the Deco XE75 Pro.  Cans 1, 2, and 3 are each wired to fiber.  Can 1 is my main, and 2 and 3 are wired downstream from the main.  For months since inception all worked fine, delivering predictable and acceptable wireless signals, with each Can showing a green light signal.  Now, Can 3 has a red light and isn't delivering a wireless signal.  I tried rebooting each on the app and got a "Failed to save information. Try again later" message.  I tried unplugging Can 3, waiting a while and replugging.  Eventually it showed a green light with wireless signal, and then in a few days turned red with no signal.  I know Can 3 is getting the wired signal (this can is in family room and a TV is plugged into that can ... and such TV shows wired internet).  But no wireless. 
 

suggestions?