Deco M9 Plus three pack not working
So I just picked up the three pack of the TP-LINK Deco M9 plus for our house. According to the diagram at the top of this page, I have them hooked up in the "star network" configuration.
Main deco is hooked to cable modem. Then that deco is hooked to my TP-LINK switch. My other two Decos are hooked via wired connection to that switch.
It is set in router mode. I set up the main one first, works fine. Then I added the other two. I didn't pay attention to the status lights on them later as I went straight to bed after. But internet speeds and coverage were awesome. But then tonight I noticed that they were both blinking red. App says they're connected fine. The main deco is solid green. But the other two aren't working. I've tried rebooting them, even re-adding them. Can't quite figure out what I'm doing wrong.
I did try removing them, resetting to factory, and then adding just one via wireless only, rather than wired. It found it, connected, app says it's healthy, but it is doing the same thing, just blinking red. Occasionaly blinks green for a second, then goes back to blinking red.