[TheRealPomax]

at the very least, check which version you're on. The auto-updater is one of the parts that's unreliable.

[throw0101a]

* https://blog.thunderbird.net/2023/01/important-message-for-m...

* https://office365.mcmaster.ca/reconfigure-mozilla-thunderbir...

If you've constantly upgraded over the years, try creating a new account or even reseting your profile. Perhaps there are/were some 'stale' settings that are messing things up.