Other than the block of red ongoing no other signs of the connection dropping for 30 seconds or longer several times in the day, you would see a top to bottom narrow red block if that was the case.
30 devices might be swamping the NAT table of the router, both the SuperHub when you used it as the main router and the new wireless system.
A pain but suggest trying to cut down the number of devices used for a period of a few hours to see if things improve. if they do then a more powerful router in terms of NAT table is needed.
Another possibility is that the drop outs are not the connection vanishing but DNS resolution problems, and the way to check this is to manually set the DNS servers used by a device and see if that one keeps working when others have problems.
Google DNS servers 8.8.8.8 and 8.8.4.4
OpenDNS servers have a handy guide for different operating systems
https://use.opendns.com
Another thing to do is leave a common prompt open and pinging a server that normally responds and see if the ping train drops when other activity stops working.