Ok finally getting back to this. Here is the versions:
VMware VirtualCenter, pid=3970, version=6.5.0, build=7515524
ESXi 6.5 Patch 02 build 7388607
The hosts were ESXi 6.0 and on a vCenter 6.0. The hosts were moved to a new build vcsa 6.5 - 7515524. After adding them to a cluster and disabling HA we run an automated upgrade of all the hosts to ESXi 6.5 build 7388607. The automation places host in MM to evacuate vms and upgrades the host. After it reboots it stays disconnected.
This has worked before. Does anything I describe here sound off?
Thanks to all