NMAP Discrepancies

[Michael Lubinski <michael.lubinski () gmail com>]

Anybody know why NMAP reports differences every so often with the same port.
E.g.

-3389/tcp  open  microsoft-rdp Microsoft Terminal Service
+3389/tcp  open

The same scan is run every time, sometimes it displays the service (using
the -sV switch) and sometimes not?

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