PfSense freeze on KVM/Qemu after an unknown time

[galphanet]

Hello,

I use pfSense 2.0 (i386 and amd64 tested) on a KVM/Qemu VM.
(VM server is a proxmox PVE server)

I have two interfaces with e1000 driver.

The virtual machine freeze after an unknown time (sometime 6 hours, sometime 4 days) with RAM memory full.
I must do a reset of the VM but nothing in logs.

How can we resolve this issue ?

Thanks you