We just experienced a 4 minute 'outage' on our z/OS system.  (single image 
z/OS 1.9 system).

By 'outage', I mean we could not communicate with MVS through TSO or the 
z/OS consoles.  There is a 4 minute gap in SYSLOG.  The same for CICS, IMS 
and DB2 logs.  

There were no system dumps or other indicators.

We reviewed SYSLOG for the 15 minutes that preceeded the 'outage' and did 
not find anything.  TMONMVS had a 4 minute gap in the collector during 
the 'outage'.

Any suggestions how we can determine what happened?

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