Why does the video window keep minimising then opening again?

I'm slowly working through all the problems I am having with my laptop, and this one is just a bit weird - nothing more than an inconvenience, but it sorts itself out.
If i am watching a video / TV show in iTunes (opened in new window, not in iTunes window) and am doing something else (eg using safari), then i try to move the movie (as it is now not the active window), sometimes it moves, sometimes it pauses for no reason (I am clicking the bar with the videos name in) and sometimes it freezes, the video window minimises then instantly comes back up from the dock...
Does anyone know why it may be doing this?

Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
This can be a problem with session restore.<br />
Firefox stores session data every 10 seconds to make it possible to restore a crashed session.<br />
If you have (security) software that interferes with that or have many tabs open then that cause cause a delay.<br />
You can try to increase the session store saving interval to see if that has any effect on the freezes.
See:
* http://kb.mozillazine.org/browser.sessionstore.interval
*http://kb.mozillazine.org/about:config

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