IMO you need to establish if this is the Edge router, NEST cameras or the MR42 that is the root cause of the issue. If other devices also go offline do a tracert 8.8.8.8 to see where the traffic times out. Do it both wired to the network and next whilst connected to the MR42 (not simultaneously). Internet outages can be caused by your router, loss of wireless connectivity or drop in the connectivity to your router from the ISP depending on the type of connection you have. Finally EA4500 also has WiFi, ensure it is disabled to stop signal conflicts. Hope this helps. Cheers
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