Did you try a reboot?
3GB of RAM? If that's not a typo, it's barely enough to run the O/S
And speaking of which, what O/S are you running?
I have the same problem with this version on Mac OS 10.9.1 with 16GB RAM, 2TB hard drive, 1,7TB available. I have to restart InDesign after a while, it happens even with single page INDD files without any image. I have informed some form the InDesign team but I have not enough hard facts to submit a bug report, it is not happening all the time but when it starts it is anoying.
Which other programs are running at the very same time? Backgound? I want to know it to find why it is happening here and why it is happening with you so that I can gather some hard facts to submit a bug report.
I had Illustrator, Acrobat, Safari, Chrome and Mail open at same time. Only Mail, Safari and Chrome were running.