When ISP drops connection, so does my wireless connectivity

I am not sure where the disconnect is here with my wireless setup, but any time that my ISP drops connectivity (cable modem is still on but no connectivity, thanks Cox), my internal wireless connectivity does as well and does not return until I get ISP connectivity returned.  Wired clients stay connected to my internal network, but wireless APs are no longer accessible.

I don't have anything elaborate set up with wireless other than this new MESH network that doesn't work well at all (lot of errors in the log related to the new AP - separate post incoming on that).

APs are Sophos brand

Bridged to AP LAN

Standard security (WPA2 Personal)

What am I missing?  

Thanks.