Gentlemen, I have been experiencing the very same issue. I'm running MS Office Word 2013 via my subscription to Office 365, which, in turn, was acquired in August 2014 when I purchased Microsoft's Surface Pro 3. You'd think that if my hardware
is made by Microsoft, its OS is made by that company, and its integrated office suite is also made by that company, you would be best positioned (better than using a computer where the hardware, OS and office software were from differing companies) to operate
trouble-free. Well, in several respects, my hopes have been dashed.
On numerous occasions each day, but not every time, I've experienced this "hang" problem, when trying to "SAVE AS" to my local C drive. It seems to make no difference whether it is a large size or small size file. My only
option has been to: (1) use Task Manager to forcibly close the Word program, thus losing everything I've done, and (2) re-boot the computer (fortunately, shut down and re-boot on a Surface takes a half minute total, even with login) and then restart
Word, and create/save a totally blank document in the intended save location, after which I can then use CTRL-S to save the document as I expand its contents from zero at the start.
My Surface is set to automatic updates on all three aspects (firmware/hardware drivers etc., Office 2013, and the OS, and related Windows files). I've gone into update history and have zero error messages - all updates have loaded successfully, and
there are no more updates to obtain.
This is intolerable. Microsoft needs to attend to this, or else, as with another comment earlier, I will be forced, due to the loss of productivity and waste of time (and sometimes loss of very good thoughts I'd written down and now could not recapture
or reconstruct), to go to WordPerfect.
I'm not terribly anxious to go try out various unofficial, non-sanctioned little patches or fixes, and risk fouling up my computer setup even worse (given that I am not an expert anyway and might mess up the suggested fix). We need to hear something
from The Source, from Microsoft itself, in an approved, sanctioned manner, on how to stop Word from hanging on "Save As."
Many thanks