A lot of this turns out to be an issue in our data center blocking API requests as malicious. This is probably because ComicRack does some crazy things. Also it seems there's been an update to ComicRack that makes this worse. We really don't support ComicRack in the first place, it's been a thorn in the engineers' side since its been a thing. ComicRack needs to be throttled back significantly. We'll be adjusting the API soon to deal with this.
In any case the data center blocking has been stopped.
I will add just as a suggestion that there are a LOT of comicrack users who would have no problems paying for a "premium" subscription to comicvine to avoid a lot of throttling and to help you guys scale better to handle the load.