Several times now while working on a Word file that is linked into Google Drive Word suddenly the cursor steps rapidly backward as if the up arrow key is stuck, or deletes forward as if the delete key is stuck. I cannot do anything to stop it while it is happening and no, there is nothing obvious like something pressing on the keyboard or mouse, and no stuck buttons/keys.

I cannot then 'save' or 'save as' the file, even if I close every other program, and have to force Word to close via Task Manager and/or rebooting. As it closes, last time at least it allowed me to save the last updated version to the backup folder, and that file is fine; last Google Drive version was hours older, perhaps I hadn't regularly saved.

I am using a laptop with mouse and keyboard, has happened at two different locations with different mouse/keyboard/screen setups and different internet providers. I doubt it is a virus or intruder as have up to date firewall etc (McAfee), and the problem has recurred intermittently over a few months ....

Phil