Problem with the Ben-Hur (1959) bluray disc

[Hobbit1979]

I'm not sure where to post this, but anyway I just had a very weird problem with Ben-Hur 2011 release Uk disc region B.

I played the movie in my new LG 4k player for the first time. It froze at chapter 21, struggled a lot and resumed play at chapter 23 as if the disc had some damage. I have the movie in my collection for some time. That was the 4th time I watched it. The previous 3 in my old bluray player (still working) went great with the exception of one time when the movie froze at chapter 21 for only one second but resumed play right away (no skip) without any other problems.

So I thought there was a issue with my new 4k player. The back of the disc is flawless, zero damage of any kind. I cleaned it just in case, very carefully. Same result.
Then I tried to play the disc at my old bluray player. As I said I played the movie there 3 times in the past with no major problems. But not this time. The same thing happened, even the old player for some reason, this time around can't play chapters 21 and 22. Resumed play at chapted 23 after a lot of struggle, exactly as it happened at my 4k player. I tried it 2-3 time again after 5 minuted on both players. Exactly the same results.

I don't get it. How that happened? The disc has no damage, nothing, it's perfectly clear. The 3 previous time played ok (with that minor, one second, exception). Why does the disc has that problem all of the sudden? It's been 3 years since the last time I played the movie. The disc remained at the self safe and sound. What could have happened???

Never had a similar problem is the past with any of my discs, and I rewatch my movies often.