This issue occurs if you have changed some of the settings in the ESXi host.
Modifying these parameters require a reboot:
ScratchConfig.ConfiguredScratchLocation
ScratchConfig.ConfiguredSwapState
Net.EtherswitchHeapMax
Net.TcpipHeapSize
Net.TcpipHeapMax
Net.TcpipRxDispatchQueues
NFS.MaxVolumes
NFS.DiskFileLockUpdateFreq
NFS.LockUpdateTimeout
NFS.LockRenewMaxFailureNumber
NFS.HeartbeatFrequency
NFS.HeartbeatTimeout
NFS.HeartbeatDelta
NFS.HeartbeatMaxFailures
NFS.MaxVolumes
NFS.VolumeRemountFrequency
NFS.SyncRetries
NFS.LogNfsStat3
NFS.MaxQueueDepth
Net.TcpipSocketMax
Net.TcpipUseIoat
Net.DVSLargeHeapMaxSize