TikTok Videos marked as “Unavailable”

I’ve had multiple instances recently where a video was marked as unavailable in my Favorites. Usually I just remove them, but one video from a couple years back got me suspicious because I remember the video and it was strange if the account private for deleted that specific one. The account was very much still active. I went to search for it, and sure enough, it was still there, I refavorited it but I started to get paranoid about how many times it’s happened before as I normally don’t recall which videos used to be in my Favorites. It happened to me again today. Has anyone else experienced this? Multiple other old videos which would be strange to be randomly deleted are also missing.