Description of problem:
Since updating to 16.2.5, neutron randomly stops working with "error: Hash Ring returned empty when hashing".

We find nothing in the logs explaining why ovn/ovs or neutron is breaking like that so far.

controller00:
2023-06-09 14:19:19.747 27 ERROR networking_ovn.ovsdb.ovsdb_monitor [-] HashRing is empty, error: Hash Ring returned empty when hashing "b'7baee1cb-75c4-4275-8ba6-ee6f33b015d6'". This should never happen in a normal situation, please check the status of your cluster: networking_ovn.common.exceptions.HashRingIsEmpty: Hash Ring returned empty when hashing "b'7baee1cb-75c4-4275-8ba6-ee6f33b015d6'". This should never happen in a normal situation, please check the status of your cluster

controller01:
2023-06-09 14:19:19.732 33 INFO neutron.wsgi [req-cc773860-ef35-4a22-805a-c3b7f350173a ca0aa87bb5d247ae8a122230c4883414 364f0ba173634eebb7108a575d1d8a9e - default default] 10.100.151.7,10.100.151.5 "GET /v2.0/ports?device_id=a958085e-a114
-4e51-b52c-e395d11641a7 HTTP/1.1" status: 200 len: 186 time: 0.0281248
2023-06-09 14:19:19.746 26 ERROR networking_ovn.ovsdb.ovsdb_monitor [-] HashRing is empty, error: Hash Ring returned empty when hashing "b'7baee1cb-75c4-4275-8ba6-ee6f33b015d6'". This should never happen in a normal situation, please check the status of your cluster: networking_ovn.common.exceptions.HashRingIsEmpty: Hash Ring returned empty when hashing "b'7baee1cb-75c4-4275-8ba6-ee6f33b015d6'". This should never happen in a normal situation, please check the status of your cluster

Version-Release number of selected component (if applicable):

How reproducible:
Random, 2 environments

Steps to Reproduce:
1. Random
2.
3.

Actual results:
Neutron stops creating ports

Expected results:
Neutron should not stop doing what's it's doing

Additional info:
2 environments so far were impacted by this issue, we rebooted the hosts and service came back.