Cameras not discoverable and offline with eero installation

[readingaway]

I have one Arlo Q and 4 Arlo Pro cameras attached to home network. We "upgeraded" to Eastlink's erro system today and now having Arlo troubles. I have tried temporarily disabling 5ghz with the eero app and that did not help. I removed all the base station and the 5 cameras.  The base station reconnected and has stayed connected.  The Arlo Q came back too.  2/4 Arlo cameras were discoverable but, after renaming, immediately went offline.  The other 2 are not discoverable.  So, I have one working camera (arlo Q), 2 Arlo Pros that are offline, and 2 that are not discoverable.  Any suggestions?  I have hit my level of understanding for troubleshooting and, of course, way out of warranty so cannot ask arlo.

[jguerdat]

You can, in fact, ask Arlo - support doesn't end after the warranty times out. 

What are the LEDs on the base showing? What do all LEDs on the base and cameras show when trying to sync? What happens when you push the sync button on the "offline" cameras and base? In some ways it sounds like interference - move the base away from the router.