Announcing availability of OrbiOS 2.1

Having been a very early adopter of 2.1.1.16 and experiencing a lot of wifi disconnections I decided to wait a day or so before upgrading to the beta software.  Just over 24 hours ago I upgraded as follows RBR50 to 2.1.2.10, RBS50 (2) to 2.1.2.10 and RBW30 (1) to 2.1.2.2.  Everything seemed rock solid so I decided to try the ethernet backhaul to one of my RBS50 satellites.  Within moments of plugging an ethernet cable into one of the LAN ports of the satellite and the other end into a remote switch located near the satellite the network just went into a cycle of crashing, coming back up, crashing etc.  I have a number of IP cameras both on the LAN and remote (on iSPY) and they were streaming video, then disconnected, coming back and then disconnecting again.  I waited 15 minutes to see if things would settle down but then gave up and disconnected the ethernet cable.  After about 5 minutes and a power cycle of the RBR50 things returned to normal.  I see from this thread that others seem to be using ethernet backhaul without any issues.  I haven't found any instructions saying there is some particular way to connect the RBS50 to the RBR50 via the LAN so can anyone shed any light on what I am doing wrong?