Version of InDesign? Operating system? Newly installed? Happens with one file or with all files?
Creative Cloud 2015 OS X El Capitian 10.11.1 - Both Installed 6/11/15
Its happened twice with two separate files. I might add also we have just updated our client files from Bit Torrent to a NAS system (not sure if this makes any difference)
Start by restoring your InDesign preferences:
But, it doesn't happen on other files? Are there resources those two files share, like a particular font, or a particular graphic? Could be a corruption issue also.