On the Fortigate, a couple of S2S VPN are made to a Vmware Edge Firewall. One S2S VPN interrupts so every 45-48min but only for 2-3 seconds. Phase 1 goes down + phase 2 goes down but comes right back up. The other VPN configured exactly the same do not have this problem.
The Fortinet Security Fabric brings together the concepts of convergence and consolidation to provide comprehensive cybersecurity protection for all users, devices, and applications and across all network edges.