A family of Microsoft word processing software products for creating web, email, and print documents.
Hi Julian,
Thanks for posting in the community.
For the case that you co-authored the document with your colleagues, may I know if your colleagues can still edit the document when the issue happened on your side? If it works well on your colleagues’ sides, the issue seems caused by the local environment.
For this message, I am afraid I haven’t found a definitive answer from the official documentation. Based on my search, some users mentioned the issue is caused by the add-ins/macros or easily appears in the large size documents. If you can reproduce the issue in a local document, please try to set Word into Safe Mode, then test again, check whether the issue still exists. Close Word, press win + R, in the Run box, type winword /safe, and click OK and reopen the document to test. If the issue exists in an online document, please try to disable the add-ins before opening the online document, then check again.
Also, you can try to set Windows into Clean Boot and check whether the issue is caused by the startup items.
If the issue still exists, please provide your Office version. Click File> Account, please provide a screenshot including Subscription Product and About Word.
Regards,
George