OK, so now I just about had it with this Netgear setup I bought.
Seven week old setup of RBR50 and a wired RBS50. fwV2.3.5.30 on both devices.Router Connected to a CTS HES 3106 Fibre converter switch.
After initial setup the system was running fine, serving a mix of connected and wireless clients. Great speeds too. However after 3-4 weeks I experience losing wan connection weekly on both wired and WiFi devices. WiFi still working though.
Logging in locally with the orbi app i displays the RBR50 as having magenta ring and no internet connection. Selecting Internet Speed displays a healty 300/300 connection.
Turning off WiFi on the phone and logging in remotely displays a RBR50 with green ring and INTERNET ONLINE. 
Rebooting the Router makes everything OK.
I would have guessed this was a mature product by now. Scanning through the forum on similar topics I only see suggestions that users should hardware reset and spend time making new setups trying different, often unrelated, changes in settings.
Again, as stated in other thread, I come from previously using an AC3200 Router that never required a reboot or stopped traffic in five Years.
