WAN latency when in HA

[random1104]

Hello,

I wonder if anybody has seen this:

I have two opnsense VMs in different Proxmox hosts, both have access to the same VLAN that connects them to the only cablemodem. Both VMs get their own IP (the ISP asigns up two IPs for this account).

Both VMs are connected to Internet and there's an failove IP on the LAN side. The thing is I see from time to time (some days it's fine) high latency in the WAN gateway test (> 1000ms) and from 0 to 5% packet loss.

If I shutdown one of the VMs, latency goes back to 30ms. I'm kinda lost right now...