I was having the same problem but it took months before the mmc.exe started terminating abnormally every single minute. For a very long time it would only terminate every so often.
I renamed the mmv.exe file to mmc.old then restarted Domino. Problem did not go away.
I went back and found that a new mmc.exe had been created and I ran it then found that others had previously opened the services snap in (from the recent files menu) and I opened that. When I went to shut down MMC Console a prompt appeared saying the services snap in was saved using an earlier version of mmc and did I want this to be updated to the new version. I said yes. Rebooted the machine and the problem went away.
mmc.exe is calling NotesInit and exiting without calling NotesTerm… Two questions… What is causing it to call NotesInit and second why is it exiting without calling NotesTerm.