I found the test web cam program hangs after running 10+ times. I guess there might be a system buffer burst. I googled and found someone haaving a similar problem suggested to updata the RPi firmware. So I just did it as suggested.
rpi-update - An easier way to update the firmware of your Raspberry Pi.
https://github.com/Hexxeh/rpi-update
Installing under Raspbian
To install the tool, run the following command:
sudo apt-get install rpi-update
Updating
Then, to update your firmware, just run the following command:
sudo rpi-update
Activating
After the firmware has been sucessfully updated, you'll need to reboot to load the new firmware.
Reference - pygame.camera hangs on get_image()
http://www.raspberrypi.org/phpBB3/viewtopic.php?f=32&t=43835
.END
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