Connection Lost

For weeks now, I have been unable to update any of the galleries on my photography website. I am able to upload new media to my site, but every time I try to add a new portfolio or update an old one, I get the following message: Connection lost. Saving has been disabled until you’re reconnected. We’re backing up this post in your browser, just in case.

Very frustrating!

After reading older forums that discuss the same issue, I have tried uninstalling and reinstalling WordPress, and I have tried deactivating all plugins…both to no avail.

Suggestions? Thanks!