I've upgraded from ER605 to ER707-M2 to increase the no. of VPN IPsec site-to-site access.   But when remotely accessing the sites via the OpenVPN, the ER707 hangs-up, you can view through the OC300 controller that the local IP address of the OC300 disappears.  Wait for 5min then the IP comes back and ER707 comes back.    This doesn't happen with the ER605 when opening the CCTV apps.   What seems to be the problem, your help will be much appreciated.  Thanks!