Commit to git randomly fails

When I try to commit to git using PyCharm, it sometimes succeeds and sometimes fails.  By "fail" I mean the reformatting, code analysis etc. if any are performed, the warnings and TODOs if any are offered for review, and then the Commit Changes dialogue box remains on screen.  I sometimes have to push Commit 5 or 6 times before it succeeds.  There is no message in the git log when it fails, so it seems the git commands are just not being issued.  This happens whether I am using Commit or Commit and Push.  I can find no pattern to when it succeeds and when it fails.  Can anyone suggest something that might be causing this?