The error comes about every 5 minutes. It is a topology error which says:
A certificate validation operation took 15011,3324 milliseconds and has exceeded the execution time threshold. If this continues to occur, it may represent a configuration issue. Please see http://go.microsoft.com/fwlink/?LinkId=246987 for more details.
The solution i found in a KB article of microsoft:
$rootCert = (Get-SPCertificateAuthority).RootCertificate New-SPTrustedRootAuthority <i>-Name</i> "localNew" <i>-Certificate</i> $rootCert
Hope it helps you.