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Sounds like they are not linking correctly or have become corrupt.
Have you checked the links panel to see if the links are broken?
Are the files stored on an external drive or a folder/drive that's linked to a Cloud service?
First thing I'd try is
If a document is not behaving well then try
File>Export
Choose IDML
Open the IDML in InDesign
Save the file as a new InDesign file with a new name
See if the issue persists.