If you have been having trouble getting Ethernet backhaul to work or other stability issues with Orbi, read this thread.
https://community.netgear.com/t5/Orbi/OrbiOS-MR-2-1-issues/m-p/1506307#M23649
https://community.netgear.com/t5/Orbi/OrbiOS-MR-2-1-issues/m-p/1506307#M23649