Well I have lost posts as well, a few times, and like you they were when the forum "hiccups". But if you don't close the browser, and you just refresh the page to your (now empty) reply, the "Restore Auto-Saved Content" button should appear. Run the test yourself:
1. Start a reply, a few sentences. Remember auto save only happens every few minutes so give it time.
2. Refresh the browser, wiping out the post you were working on
3. Go back the exact same message to which you were replying
4. Click Reply, you should see the button on the lower left.
5. Click that and your reply should be mostly restored (at least up to the last couple of minutes)
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