As has been mentioned in the thread, it's common for discs to go bad. This isn't a new phenomena - it goes all the way back to laser rot in the laserdisc days. Tons of bad Warner Home Video (WHV) discs because of the bad plant in the late 00s, certain Criterion Collection discs that go gold before crapping out, and on and on. Many times, it's the glue holding two layers of the disc together that goes bad, rendering the back half of the disc inaccessible - which is just what happened with the WHV discs. Compounding the issue is there's no telling how quickly it'll hit. Some of the bad discs went to shit right away, some of them in my collection are still playable... for now. At least with Warner, their home video division responds pretty quickly to issues. I was able to get replacements for a Katharine Hepburn/Spencer Tracy set I bought used from a brick & mortar reseller years after it was originally released.