Photoshop CS6 intermittently freezes with no error

Question

Photoshop CS6 periodically freezes on my iMac running 10.9.5. It did the same thing on 10.9.4. I tried uninstalling and reinstalling; this did not help. I don't use any plug-ins and haven't modified Preferences. When it freezes, there is no error message, but I cannot move the main Photoshop window, nor can I click on any buttons or move sliders or use any of the options in panels. Curiously, I can pull down menus in the top menu bar (File, Edit, Image, etc.) but since these menu options open dialog boxes that are not functional, I'm pretty much dead-in-the-water.
If I open the Force Quit Applications window (Cmd-Option-Esc), Photoshop looks like it is running normally, i.e. it doesn't say "Not Responding". If I Force Quit anyway and restart, Photoshop behaves normally for a while (time varies) and then freezes again.
This behavior does not seem to be associated with any particular action or command that I can discern. If I don't Force Quit, then Photoshop eventually recovers on its own and starts working normally for awhile before freezing again. Anyone have suggestions for corrective steps?

Answer 1

BOILERPLATE TEXT:
Note that because this is boilerplate text, not all points may apply to any given, specific poster.
If you give complete and detailed information about your setup and the issue at hand,
such as your platform (Mac or Win),
exact versions of your OS, of Photoshop (not just "CS6", but something like CS6v.13.0.6) and of Bridge,
your settings in Photoshop > Preference > Performance
the type of file you were working on,
machine specs, such as total installed RAM, scratch file HDs, total available HD space, video card specs, including total VRAM installed,
what troubleshooting steps you have taken so far,
what error message(s) you receive,
if having issues opening raw files also the exact camera make and model that generated them,
if you're having printing issues, indicate the exact make and model of your printer, paper size, image dimensions in pixels (so many pixels wide by so many pixels high). if going through a RIP, specify that too.
etc.,
someone may be able to help you (not necessarily this poster).
a screen shot of your settings or of the image could be very helpful too.
Please read this FAQ for advice on how to ask your questions correctly for quicker and better answers:
http://forums.adobe.com/thread/419981?tstart=0
Thanks!