Sign into an existing account

Ive attempted to reply the same comment four times now.
The first three times vanished like a puff of smoke. Not sure why.
I made a test comment and reply elsewhere and it works fine.
When you comment the entire page refreshes. After the comment is submitted does leaving the page before a certain point affect if the comment is saved?

If you vote on a post before a page loads all the way the page will reload and ignore your vote attempt. Pages load slow sometimes so its a nuisance. This issue is highly repeatable.
I use voat mode.

Edit: The vote issue has been around for a good while. Ive just been ignoring it.