Excel 2013 changes hyperlinks to local drive

hi guys

This is driving me mad. I've got a large doc (and a looming deadline) with a lot of hyperlinks to a work drive. I've opened it up today and all the links have changed - they've been chopped in half and redirected to my C drive.

I can't find anything about this online that's actually recent. Every topic seems to talk about moving from 2003 to 2010 (we've been using 2013 for years), and the doc was always saved as a 2013 document.

What can I do to ensure this doesn't carry on happening? and is there a way of fixing the broken links?

I'm using W7 on PC, Office 2013.

Thanks.

EDIT - office 2013, not 2010.

We would need to see samples of what you had, I know of no "change" that just happens