CBR40 Firmware 2.5.0.24

House is 3500 Sq feet single story and I'm running CBR40 router at one end of the house connected to Xfinity with an RBS40 on a wired connection to the router in the middle of the house and 2 RBS20 satellites connected wirelessly on 5ghz connections.  Network Map shows CBR40 wired to RBS40 with both RBS 20 satellites connected to RBS40 directly.  The RBS 20's are both about 30 feet away and one is in the attic.  

All FW is up to date and I did a full system reset on all units and brought them back one at a time. That seems to have addressed the satellite issues.  Yes, we have wifi neighbors but no new neighbors or observed changes.  I went ahead and matched the recommended configuaration changes and hope that will help - though it took a while for the satellites to reconnect. 

The main issue now is the router dropping the internet every 30 mins or so which would appear to be a router issue, not a wifi or wifi config issue.  My pc is hardwired to the RBS40 (which is hardwired to the CBR40) and the internet is still dropping out.  Router and hardwired connection has been super stable until this latest firmware update.     

What I have also noticed is that if I click on "Cable Connection" in the Basic Menu I get an error screen saying that the router didn't send a signal and then the internet drops.