Its not the individual instances but the underlying project.

Its not even the maintainers fault. Its a cat and mouse game. The devs have done an epic job of keeping up, but ultimately all of these projects are unreliable.

yt-dlp is the gold standard and provides the back end for many of these projects, but its cli only.

Ive found freetube desktop app to be more reliable than invidious. Also pipepipe for Android.