I left Blogger to get away from stuff like this. Yesterday and today I have had the following constant problems:
408 errors when trying to publish a post
503 errors when trying to access my dashboard
Publishing posts that will only save as drafts and old ones at that (not saving any changes)
Winding up with 4 or 5 generations of the same draft post
Regular commenters unable to comment on posts — I have modification enabled and I got two e-mail notifications, I’d click on the link to approve and it would say No Such User … there are no comments in modification on my dashboard and I know they are there!
Your best bet would be to submit a feedback with this issue giving specifics if you have them and bring this up with staff. We can do little to help you here in the forums as we volenteers here and none of us have access to the backend.
*chuckle* As a quick aside and taking off my moderator hat for a moment, I could tell you horror stories about your ISP. I have an entire city blocked from access to my boxes due to a user of theirs in Midland, Texas. Going on five years of complaints now about his DDoS attacks.