Virtual machines running until they are switched off. After that, do not run - write messages like "VMware ESX can not find the virtual disk"/vmfs/volumes/vsan:52c4ee4f9bbc49e9-a63e41ac45569fe0/ca76de55-05af-9084-9d8b-0cc47a129a5a/Win7x64-000001.vmdk". Verify the path is valid and try again "
esxi 6.0.0 3247720
vsphere 6.0.0 3018524
vSAN Disk format version 2.0
Bit of configuration information would help to set the scene, number of hosts, disk groups and the policy applied to the vSan datastore or individual VMs. Have you confirmed the overall health status of the vSAN and if any components of virtual disks are being reported as absent or degraded?