I am new to the Forum. I really hope this helps.
A few months ago I started purchasing Walking Dead episodes from iTunes, and an entire season of Dino Dan for my daughter. I noticed that when playing right in Itune (not in separate window) after 3 minutes and 20 seconds the video would just shut off. No lock ups or anything just the window would disappear and that was that. SO, I tried opening it in another window. I noticed that if I had the video in full screen the movie would close after the previous mentioned 3 and 1/3 minute. However, if it was not in full screen mode the video would just kind of....blink/flash (almost not noticeable). Furthermore, after about 45min the video would lose sound and continue playing but look like it was flip book animation. So I started to use Amazon Unbox. It’s a decent program and I have no real problems with it except no CC for hearing impaired (my mother is hearing impaired). I have noticed that I have the problem when using just QuickTime as well. This makes sense since that is what iTunes uses. Media player doesn’t have the problem but also won’t play movies purchased from iTunes because of how fair things are for the consumer. Amazon Movies/shows will only play in Unbox.
Just when I was convinced that it was something conflicting with iTunes only, I notice that Netflix will also not play in full screen for more than 3 min and 20 sec. It will change to the in browser view and continue playing.
No matter what I am doing. I leave my computer alone for 3 min and 20secs the screen flashes a bit (almost not noticeable). I have tried to watch the processes in the back ground as I originally thought it had something to do with Norton. But even after removing Norton the problem continues. I just want to be able to use iTunes, and Netflix. I also don’t want a bunch of media files with different DRM. This has been going on for a year. Thanks for your help.