What this message means

[ReynierPM]

Hi every:
Today I get this message from one of my checked hosts: "Notifications 
for this host are being suppressed because it was detected as having 
been flapping between different states (24.2% change > 20.0% threshold). 
When the host state stabilizes and the flapping stops, notifications 
will be re-enabled."

What this means? What I need to check on this host?
-- 
Cheers and thanks in advance
Ing. Reynier Pérez Mira

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