I have a daewoo 5700 region free

However I have a problem with a region 4 movie: AI (Artificial Inteligence) when I put the DVD it loads and freezes....

I have to power off the unit in order to take out the dvd becuase EJECT button doesn't work anymore...

Disk 1 freezes but disk 2 works just fine...

Any clue ?? Can anyone help me??