This issue has been found to be due to incompatible Microsoft Word 'add-ins' that are installed by various applications, often without your knowledge, that enhance the application's integration with MS Word.
Open MS Word and open a blank document. Go to File > Options and select Add-Ins.
One example shown below is of a known Add-In that causes this issue. Removing it should cure the issue.
Highlight the Add-In and select [Delete] on your keyboard.