pfsense 2.4.5 LAN traffic suddenly stops on Proxmox 6.3

[Marco Aurelio Costa]

Hi there,
On my environment setup, I use a Proxmox as a hypervisor, and a pfSense as a "border" device to establish the communication between my environment with the internet.
The pfsense is responsible to give LAN DHCP and guarantee the in/out traffic with my LAN VMs.
Pfsense has nic e1000 and each VM has nic virtio (this could be the problem).
Everything works fine, but sometimes, pfsense suddenly stops routing In/Out traffic to VMs, and all the VMs turn isolated from the internet.
Does anyone have a similar issue?

thanks in advance for your support