Waiting for quorum

Hi,

I have a problem I don't understand, thank you in advance for any help

I have a 2 node cluster without HA distributed over 2 sites linked by a VPN.
On each site 1 PVE and 1 PBS.
Each PVE has 3 network interfaces:

• one for PVE
• one for backup
• one for the vm network

Between the main site and the remote site, all interfaces ping each other.

Everything was working normally, but for some time now each node has not been able to see its partner.