A family of Microsoft word processing software products for creating web, email, and print documents.
Based on what you described, it sounds like the issue may involve Microsoft Word, Dropbox file syncing, or the interaction between the two rather than your Mac itself, especially since you have experienced the same problem on two different MacBooks. Although Word may display "Saved," Dropbox may not have finished syncing the latest changes, or the document could have become corrupted when Word unexpectedly closed. Since your IT team has already had you test Word in Safe Mode and the issue has continued, the next step would be to check whether Word and Dropbox are fully up to date, disable any unnecessary Word add-ins, and try saving the document locally (outside of your Dropbox folder) to see if the problem still occurs. If the issue only happens with files stored in Dropbox, it may indicate a syncing conflict. You should also ensure that AutoSave and AutoRecover are enabled and configured correctly in Word, and report the recurring issue to both your IT department and Microsoft Support so they can review crash logs and identify the root cause.
I hope these steps help identify the cause and prevent any further loss of your work.