Do you use the mobile or web app at all? If not, can you confirm if the option to sync to the mobile/ web is on?
To confirm, please navigate to Edit > Preferences > Mobile & Web, there will be an on-off toggle.
May I also ask that you please take a moment to review the steps and information available here and confirm the location of the data file? Is the file stored on the hard drive or a cloud drive?
Storing the file in a cloud drive may cause the issues you have described. Please let us know what you find!
-Quicken Tyka