Are videos you watched that previously had subs no longer showing them?

On my sererver i use bazaar to try and automate getting missing subs but its not perfect.

You can always manually download the video and look on opensubtitles or another site for subs that work.

One issue i run into is that devices can be very weird about which formats they work with. Some only allow srt and some work with .ass or other formats. vlc supports all of them but other apps might not.

Video on random streaming sites don't have very good quality control. Corrupt videos, missing/wrong audio/subtitles or just having episodes being missing or out of order are common.

The work around is to try other sites/sources until you find one that works or switch to downloading.

Using VLC's subtitle finder might work.