YouTube: Video Freeze Randomly in Fullscreen Mode

Problem:
When watching YouTube video in fullscreen mode, both video & audio freeze randomly. If you press Esc to exit fullscreen mode, the video will resume as normal.


Solution:
1. Go onto YouTube and select any video.
2. Right-click on the video, select Settings...
3. Under the Display tab, un-check Enable hardware acceleration.



Ref:
Adobe - Flash Player : Help - Display Settings