CMD prompt window pops up and instantly disappears periodically
Check the task scheduler, see if anything added in there could be triggering it.
I think it's fixed! I checked the Task Scheduler, like NetServOps said, and found one line item that was scheduled to run every 10 minutes. "Firefox Default Browser Agent A99BB431EF49E2C3". I disabled it and have not had the flash of the cmd prompt since! Thank you so much.
I had the same issue a few years ago, and I found the culprit using the Sysinternals tool Process Monitor.
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Download Process Monitor.
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Filter/Filter/Operation is "Process Create"/Add
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Leave Process Monitor running until it happens again.
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Check the window:
