Uploaded Documents "breaking"

Hi All

We have a number of courses that have policies or supporting documents in the resources section and in most of the courses there are also hyperlinks to the documents so they can be opened either way.

Often when I need to make edits to a course and I publish and replace on our LMS I find that there seem to be issues with the documents so that when a person goes to open it either through the resources tab or directly using the hyperlink, a new page will open saying "the webpage cannot be found".  In every case so far, I have not even made edits to the documents or the slides that have the hyperlinks.

Any ideas why this is happening every time I edit courses.  The documents were opening fine previously and if I go back and delete and re-upload the documents they work perfectly again so why is this happening?  Would love to know if I am doing something that's causing this or is there an easier way to fix the issue than deleting and re-uploading all documents?