As you say the laptop handles the video well in the beginning, then when it runs for a few minutes it has trouble rendering the video in sync with the audio.
The reason for this problem is that 720p videos need the Graphics card in the laptop to work hard, this process generates heat and this heat needs to be removed from the laptop or the whole system does what's known as throttle down.
It slows down to reduce the heat it produces, thus preventing damage to the system.
The solution to this problem is to clean as much dust out of the laptop computer as possible, use a vacuum cleaner. Turn the laptop off and remove the battery. Clean the vents, it is a good idea to raise the back underside of the laptop with a pencil or the like. Some-thing that will raise the laptop off the work surface without obstructing the vents on the underside of the laptop. By raising the laptop it will allow for greater airflow through the laptop, therefore reducing the operating temperature of the laptop therefore making it more efficient and responsive.
Your laptop shuts itself down, this confirms that it is overheating. It does this so it does not damage itself.
If it still overheats then you will need to contact a computer technician to give it a good through cleaning. To clean the dust between the heatsink fins. Possibly increase the fan speed or replace the fan.
Take care!
damnor01
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