RBR850 - no access to interface

Brand new RBK853 unboxed and installed on Tuesday 10th Nov. RBR850 is running in Router mode, with PPPoE ISP connection. All devices updated to V3.2.16.6_1.4.4 immediately after setup completed. On Thursday 12th Nov, devices were able to connect to WiFi but there was no internet. Orbi app on Android connected to WiFi would not connect and devices connected to WiFi could not access the router admin web page (router IP address is 192.168.63.1). Router LED was purple. I have had 3 different devices performing PPPoE on this connection previously and have never had an issue with any of them. Logs from some smart devices show they lost connectivity to the cloud around 10pm on Wednesday 11th Nov, so the RBR850 ran for less than 36 hours before apparently having this issue. Rebooted RBR850 and all has been working ok since (approx 17 hours).

- When did the issue start to happen? Was it only after updating the firmware v3.2.16.6? Less than 36 hours after installation
- Router IP (192.168.1.1 or 10.0.0.1) 192.168.63.1
- Firmware version V3.2.16.6_1.4.4
- App version Android app V2.6.4.1265
- Android / iOS version Android v11
- Network Setup RBR850 in router mode with PPPoE, 2 satellites both connected, Armour not enabled

- Router LED status if issue re-occur Purple