In the controller logs I found this

controller-0: 02:14:19 ERROR juju.worker.dependency "caas-unit-provisioner" manifold worker returned unexpected error: resource name may not be empty
controller-0: 02:14:27 WARNING juju.kubernetes.provider Image parameter deprecated, use ImageDetails
controller-0: 02:14:29 WARNING juju.kubernetes.provider Image parameter deprecated, use ImageDetails
controller-0: 02:14:32 WARNING juju.kubernetes.provider Image parameter deprecated, use ImageDetails
controller-0: 02:15:00 WARNING juju.worker.httpserver http: TLS handshake error from 172.31.45.131:51480: read tcp 10.1.103.72:17070->172.31.45.131:51480: read: connection reset by peer

controller-0: 02:15:21 ERROR juju.apiserver error serving RPCs: codec.ReadHeader error: error receiving message: read tcp 10.1.103.72:17070->172.31.45.131:51720: read: connection reset by peer
controller-0: 02:16:51 ERROR juju.worker.dependency "caas-unit-provisioner" manifold worker returned unexpected error: creating or updating service account: attempt count exceeded: resource is still being deleted
controller-0: 02:17:00 WARNING juju.kubernetes.provider Image parameter deprecated, use ImageDetails
controller-0: 02:17:13 WARNING juju.kubernetes.provider Image parameter deprecated, use ImageDetails
controller-0: 02:17:14 WARNING juju.kubernetes.provider Image parameter deprecated, use ImageDetails
controller-0: 02:17:18 ERROR juju.apiserver error serving RPCs: codec.ReadHeader error: error receiving message: read tcp 10.1.103.72:17070->172.31.45.131:52974: read: connection reset by peer
controller-0: 02:19:09 WARNING juju.worker.httpserver http: TLS handshake error from 172.31.45.131:54058: read tcp 10.1.103.72:17070->172.31.45.131:54058: read: connection reset by peer

controller-0: 02:19:39 ERROR juju.worker.dependency "caas-unit-provisioner" manifold worker returned unexpected error: creating or updating service account: attempt count exceeded: resource is still being deleted
controller-0: 02:19:42 WARNING juju.worker.httpserver http: TLS handshake error from 172.31.45.131:54354: EOF

controller-0: 02:19:46 WARNING juju.kubernetes.provider Image parameter deprecated, use ImageDetails
controller-0: 02:19:47 WARNING juju.kubernetes.provider Image parameter deprecated, use ImageDetails
controller-0: 02:20:06 WARNING juju.kubernetes.provider Image parameter deprecated, use ImageDetails
controller-0: 02:20:07 WARNING juju.worker.httpserver http: TLS handshake error from 172.31.45.131:54576: EOF

controller-0: 02:22:04 ERROR juju.worker.dependency "caas-unit-provisioner" manifold worker returned unexpected error: creating or updating service account: attempt count exceeded: resource is still being deleted
controller-0: 02:22:13 WARNING juju.kubernetes.provider Image parameter deprecated, use ImageDetails
controller-0: 02:22:23 WARNING juju.kubernetes.provider Image parameter deprecated, use ImageDetails
controller-0: 02:22:24 WARNING juju.kubernetes.provider Image parameter deprecated, use ImageDetails
controller-0: 02:47:04 ERROR juju.core.raftlease command Command(ver: 1, op: claim, ns: application-leadership, model: a4b7b9, lease: argo-controller, holder: argo-controller/2): invalid lease operation
controller-0: 02:47:04 ERROR juju.core.raftlease command Command(ver: 1, op: claim, ns: application-leadership, model: a4b7b9, lease: argo-controller, holder: argo-controller/3): invalid lease operation
controller-0: 02:47:04 ERROR juju.core.raftlease command Command(ver: 1, op: claim, ns: application-leadership, model: a4b7b9, lease: argo-controller, holder: argo-controller/4): invalid lease operation
controller-0: 02:47:04 ERROR juju.core.raftlease command Command(ver: 1, op: claim, ns: application-leadership, model: a4b7b9, lease: argo-controller, holder: argo-controller/7): invalid lease operation
controller-0: 02:47:04 ERROR juju.core.raftlease command Command(ver: 1, op: claim, ns: application-leadership, model: a4b7b9, lease: argo-controller, holder: argo-controller/6): invalid lease operation
controller-0: 02:47:04 ERROR juju.core.raftlease command Command(ver: 1, op: claim, ns: application-leadership, model: a4b7b9, lease: argo-controller, holder: argo-controller/5): invalid lease operation