That happens sometimes. Might be a vendor reporting it or it might be because the link was temporarily down. Idk.
Here's a recent thread about how to repost.
How to give new link to dead post ?
From AnjaBear (mod):
If the BLOG post is yours, you go to the REPORT POST button, click it and put the new link into the AUTHOR NEW LINK section so we can replace the link for you.
If it is NOT your post – then make a new Blog Post and let us know (in the title, REPLACES DEAD POST) and we will remove the dead post and change your title text as the new version.
When in doubt, contact either @ hunter @ monkseye me or @ eelgoo