Dual WAN definitely have issues with this new firmware. If I disable Primary WAN from GUI then Secondary WAN also go into Disconnected state while showing it still have ISP IP. When I enable Primary back and Secondary also comes online. Disabling secondary works fine as Primary stays...
Did the factory reset and it seems to be working fine. WAN connection takes little longer to connect to internet after reboot but that is not a big deal. Firmware update with factory reset is a pain if you have lot of custom setting.
Well I only gave it an hour as whole house internet was down and couple to reboots. Will give it a try again with factory reset but have to do a lot of setup after factory reset. Restoring old configuration probably is same as not doing a factory reset.