Things have been incredibly unstable there.
I wish lemmy.ml (also unstable) or lemmy.world would hand out a (nearly) full copy of the database so we can get more analysis done on PostgreSQL performance behaviors. Remove the private comments and password /2fa/user, or whitelist only comments/posts/communities/person tables - but most everything else should already be public information that’s shared via the API or federation anyway. it’s the quantity, grouping, and the age of the data that’s hard to reproduce in testing. And knowledge of other federated servers, even data that may have been generated by older versions of Lemmy that new versions can’t reproduce.
It’s been over 60 days of constant PostgreSQL overload problems and last week Lemmy.ca made a clone of their database to study offline with AUTO_EXPLAIN which surfaced a major overload on new comments and posts related to site_aggregates counting (it was counting each new post/comment against every known server, not just the single database row for a server).
I have an account over on World too, and every major Lemmy server I use throws errors with casual usage. It’s been discouraging, I haven’t visited a website with this many errors in years. Today (Sunday) has actually been better than yesterday, but I do not see many new postings being created on lemmy.ml today.
Most common cause is people changing their language settings in their profile. It’s a daily occurrence. The app really needs to tell people “25 messages not displayed because you are only viewing in Spanish”.