In this question, I talked about electrum litecoin wallet keeps synchronizing.
Reinstalling a newer version works.
While I already solved my problem, it doesn't answer one aspect of the issue.
Why didn't it work in the first place?
Why do I have to reinstall a new version of electrum litecoin wallet?
What exactly went wrong?
Reinstalling newer wallet works. However, that's actually dangerous. We may reinstall the wrong wallet, for example.
I tried changing the litecoin server and didn't work out either.
What exactly went wrong with the old electrum litecoin?
The question is different than the former question in one area. The former asks what to do. That is already answered. Just reinstall newer version. This question asked what went wrong in the first place.