Do you get the same errors for all historical intervals ?
What does the following return ?
$ds=Get-Datastoredatastore4
Get-Stat2-Entity$ds.ExtensionData-IntervalHI1-QueryMetrics|
SelectGroup,Name,Rollup|ft-AutoSize
Get-Stat2-Entity$ds.ExtensionData-IntervalHI1-Statdisk.used.latest-QueryInstances
Do this fir HI1 and HI2.