Sonic analysis got really far (~17k albums) but now keeps stopping with about 8k left

What I saw is that killing the stuck transcoder would let you continue… but Plex knows it didn’t finish the file that choked the transcoder, so it goes back to it later. In other words the first and second stopping points you had are the same problem.

Here is what I found and how I solved the problem. (It’s not a great solution, though.)