The PS4 version of Final Fantasy X/X-2 HD Remaster was and still is held back by a few issues with the RNG (random number generator) and background music. But fixes are on the way.
"We are aware of the audio and RNG bugs in Final Fantasy X/X-2 HD Remaster on PS4 and rest assured that we are in the process of creating a patch to fix them," said Square Enix. "Details on timing will come soon. We're sorry about the bugs but this is your story and we want you to be happy with it."
Just when we were starting to think this patch wasn't going to happen. You hear that, Brett?