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I think that is owing to it being easier for MS Word to assemble a TOC, when the document is completely saved onto disk in a unified way.
So, where is the problem, exactly? or what do you need to know?
Note: it may be helpful (after, of course, closing all open documents completely and closing all MS Word windows and other MS Office programs and documents also...) to run Windows Update, and make sure to apply all critical and important updates to MS Office and MS Word. That could improve program operation and stability.
However if I accept all the changes then it works.
- exactly what operation is that? I need to be sure, to give you advice on this matter.
Unfortunately I can not accept all the changes at this time.
- so you want to complete the generation of the TOC by some other method, in other words?
What version of MS Word are you using, please?
(Help - About Microsoft Word
will tell you the MS Word version # *****)
Were the changes put in the document, but not Saved ?
If not Saved, then the TOC generation may be stalling because a place marked as a change, but not yet Saved, has been reached. Don't ask me what the details are - I'm not sure - but it may also have to do with the size of the document or its degree of complexity.