MP70 IPSec Tunnel Problem

Very new to the Sierra world, so still very much learning. I work for an organization that is in the process of deploying some MP70 units. We are having a very hard time getting an IPSec tunnel setup. Whenever the tunnel is enabled/configured/applied on the router, as soon as it reboots, the router starts acting very strange. A lot of the time the cellular connection light will just blink red. If you keep rebooting it will eventually turn green, but even if it does, the internet does not work on the wireless or wired networks on the router. It absolutely will not work right until you disable the tunnel you are working on. I don’t understand what could be changing on the router when the tunnel is enabled that would prevent the cellular network connection from being made. Any help would be appreciated. Thanks!

Update to this: I backed the firmware down to 4.11.2.004. On the 5 units I updated to the newest firmware, I was noticing a lot of really odd behavior. No such issues on the units since I reverted back to the old firmware. HOWEVER, I am still seeing an issue where when the VPN tunnel is enabled, clients connected to the router cannot connect to the internet. As soon as I disable the tunnel and reboot, clients can connect to the internet again. I would imagine there is a setting somewhere that I am missing but cannot figure it out.