Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Does pfsense have any kind of dead peer detection built into the VPN system? I've noticed some of my tunnels seem to just die after a while, and I have to hit the save button on the vpn panel to restart.
Sounds like lifetime mismatches.
Either way, check Prefer old IPsec SAs in System -> Advanced