That's a sign that your account is rate-limited. We rate limit accounts when they repeatedly get involved in flamewars or regularly break the site guidelines or post lots of low-quality (for HN) comments. It's a crude tool but one of the few we have to prevent such things from overrunning the site.

I took a quick look at your recent history and it seems fine, so I'll take the rate limit off. But to prevent it from kicking in again, please stick to civil, substantive comments that scrupulously follow https://news.ycombinator.com/newsguidelines.html. I recall that we had to ask you many times in the past not to violate that, but hopefully it's all in the past now and things will be nice and guideliney going forward.