UnManaged Servers Revert to Managed Following Maintenance Window

UnManaged Servers Revert to Managed Following Maintenance Window

We have 10 - 15 unmanaged powered down vm guest servers in our environment. There is a downtime schedule every week for a 6 hour maintenance window. Following the maintenance window every week all of our unmanaged servers revert to being managed and send out alerts since they are all powered down.

Any ideas on how to remedy this unwanted action?
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