URL monitors stop working

URL monitors stop working

Hi.
 
We have several URLs being monitored by OpManager but after a few days of adding them they randomly stop being managed (not all at the same time).  If we choose to manage them they are fine for a few days (or sometimes weeks) but then break again.  See the screenshot to see what happens.  The sites are working fine, so it's not that (some are internal, some are external)
 
Has anyone else had this issue?  If so, is there a solution for it, or a log file I can consult to figure out what's going on?  We are using build 8812.
 
Thanks,
Dave

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