RBS850 Satellite flashing white (connections seem ok)

Since a day or two, the satellite of my Orbi system keeps flashing white. It indicates that it is trying to restore factory reset settings (but what triggered that?) according the docs. 

Logging into the system, the administration pages indicate that the backhaul connection is good. Also devices connected to the satellite seem to operate as they should (from connectivity point of view) both 5G and 2.4G connections.

I did power cycle the satellite a few times but the flashing problem persists.

Note I have seen articles related to firmware upgrade on this issue but the firmware of both router and satellite are up-to-date v3.1.5.23 according app and ... (but there is a newer one on Netgear support)

Regards,

Hans