Your account is rate-limited. I described this elsewhere in this thread: https://news.ycombinator.com/item?id=29028227. Past explanations: https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...

If you want the rate limit turned off, we'd be happy to do that as long as we have reason to believe that you'll use the site as intended in the future. I'm sorry for the annoyance but we have to do what we can to prevent this place from burning itself to a crisp, and if you want to post without being throttled then we need your help with that.