Cluster not quorate - extending auth key lifetime!

Hello together,

we have a 2-node cluster without HA, named pve1 and pve2. pve1 replicates VMs to pve2. Both System run well until last week.
Both Systems run with Proxmox VE 6.0-2, PVE-Manager 6.0-4, PVE-Kernel 6.0-5

Now we get the following error messages

on pve1:

Nov 29 15:31:06 pve1 corosync[2244]: [TOTEM ] A new membership (1:4014312) was formed. Members
Nov 29 15:31:06 pve1 corosync[2244]: [CPG ] downlist left_list: 0 received
Nov 29 15:31:06 pve1 corosync[2244]: [QUORUM] Members[1]: 1...

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