Not long after upgrading my ER605v2 to the new firmware, it disconnected and stayed disconnected from my Linux controller.  I know a thread was created already for the EC200 hardware controller but I wanted to make sure it was known that the issue also exists with the Linux controller.  Rebooting the controller wouldn't re-initiate the connection.  I had to reboot the router.  I have now rolled back to the 2.1.2 20230221 beta build which was stable.