I have been on cable internet for 3 years and have had zero problem with my mesh system.  I switched to AT&T fiber and now my mesh system won't stay connected. I have had multiple people tell me that my system isn't "configured" to work with AT&T.  Anyone have any suggestions?  

Side note:  the installer tried to sell me at&t mesh system.  I said this one has been working great.  He shrugged and said ok, dont be shocked when it breaks