Open Stack

Hi all,
We have an Openstack Victoria cluster deployed and a provider network (IPv4) created that worked fine for months. Lately we've noticed that about 30-40% of the VM's that are spun up using this network are inaccessible over ssh, Permission denied (publickey). Also, if you add a customisation script to create a password for the Ubuntu user that fails too. 
Initially we thought it was confined to one/two compute nodes but further testing this week shows that it can be any of the 6 compute nodes we have and always the original two that we identified as being the problem. If we create the VM's from the cli and send them to specific hosts everything works fine including the original two hosts that had issues.
We're finding it hard to nail down the cause of this because it's not consistent behaviour so any tips on where to investigate would be welcome, we have a second provider net (IPv4 & IPv6) that works fine and have went through all the configs to see if there's any difference and all are identical over the hosts.
Thanks in advance for any info.
Regards,Derek

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.openstack.org/pipermail/openstack-discuss/attachments/20220818/465d005c/attachment-0001.htm>