Powershell Remove members from DLs says not there, but they are - powershell

Question

I have a powershell script that is supposed to empty a distribution list. It gets the member list into an array. It then pipes the array into Remove-DistributionGroupMember. Each run will have some members throw 'X isn't a member of the group Y' errors. At the end of the loop, I re-enumerate the users and for everyone that 'isn't a member of the group' error got thrown, is still a member of the group. This is not consistent. Sometimes everything works, but usually there are different members of the group that fail.
$grp = (Get-DistributionGroup -Identity:$DLIST -ErrorAction:Stop)
$members = (Get-DistributionGroupMember -Identity:$grp -ErrorAction:Stop)
$members | % {
$member = $_
try {
Remove-DistributionGroupMember -Identity:$grp -Member:$_ -Confirm:$false -WarningAction:Stop -ErrorAction:Stop
}
catch {
$LogStream.WriteLine((Get-Date).toString() + " Error removing ${member}:`n" + $_.toString())
}
}
$members = (Get-DistributionGroupMember -Identity:$grp -ErrorAction:Stop)
write-host "Users in List:"
$members | % { $LogStream.WriteLine(" " + $_.ToString())}
3/20/2015 5:06:55 AM Error removing xxxxx.xxxx.com/North America/Spokane/Users/XXXXXX:
The recipient "xxxx.xxxx.com/North America/Spokane/Users/XXXXX" isn't a member of the group "CN=*YYYYY,OU=IT,DC=xxxxxxx,DC=xxxx,DC=com".
Users in List:
xxxxx.xxxx.com/North America/Spokane/Users/XXXXXX

Answer 1

Try adding this to the beginning of your script:
Set-ADServerSettings -ViewEntireForest $true
And I would also add the -ResultSize "Unlimited" to your Get- commands.