I checked with neighbours this morning and they are fine and also called the service status line again and no issues reported so this looks like my issue.
I noticed that the LED on the RFoG ONU light keeps flicking between green and red, green for connection red for Alarm, so it seems to connect/disconnect which I guess corresponds with why the router reports Locked and Not Locked
ONU flickering
https://youtu.be/8Z7-RdaD8MI