I don't use the archiving feature, but it might be useful to post some of the URLs here that are failing to archive.
I remember seeing in the FAQ [1] that pages above 32 MB won't be archived. That's not much with how bloated pages are these days. I wonder if the page + assets is exceeding that limit?
> Is there a size limit on archived links?
> There is a 32 MB size limit per link, which is typically enough for all but the largest pages. Links larger than 32 MB may not be archived.
As an alternative, ArchiveBox [2] has Pinboard support.