I renamed the title of my survey in ArcGIS Online. This worked fine and even allowed me to download an updated survey from the field app. This was a name (title) change only and without republishing the survey.
The next time I published the survey from Survey123 Connect, the title reverted to the old title. I realized that I must rename the title from Survey123 Connect then re-publish. This works fine and the survey is now renamed in ArcGIS Online.
I think this might be a bug but, I'm not sure.