VisualCron 4.9.26
A job was created to run every second Friday via an interval trigger "Specific days of the week", Every: 2 weeks.  Days: Friday.  1am.  It runs fine most of the time.  But, twice in the last half a year, it has not run.  I checked the VC logs - there is no mention of it.  I checked the server logs to make sure the server was up and running ok.  Everything ok there.  I checked a working run in the VC logs - correctly shows the job running and completing.
I don't check the next scheduled run date after each run to verify it is indeed rescheduled correctly (we have lots of scheduled jobs that work fine), so I can't say for sure it was correctly scheduled for the set run date.
Please advise.
Thanks,
Matt