Ask HN: Has something changed with HN's IP ban rules?

Lately I've found myself getting IP banned abruptly and often. I guess I'm requesting too fast, but this issue has only cropped up recently and I've been addicted HN for years.

I'm not running an HN scraper, I don't have any auto-refresh extensions or scripts, and I don't believe I refresh (unreasonably) often. I'm just a guy with a fat pipe trying to use HN.

I've used the unban url, but that only works once per IP. I could just switch over to ihackernews or something similar, but I figured I'd put this here to see if any admins are aware.