Bad drive it sounds like. When we say bad we simply means that some rare fault or error has developed in the hardware that makes it do something stupid that freezes your computer. Fixing hardware that has gone bad usually isn't possible/cost-effective so your best off replacing it.
Are you sure it's the DVD drive and not the hard drive? You can check by unplugging the IDE (or whatever you rich folks use) cable going into the drive and then running the computer for a while. If there are no problems with it unplugged then you should replace the drive.
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