I had a 308 reputation about thirty minutes ago, and someone has spontaneously down-voted at least four of my answers, and voted to delete them. I expect that this will happen more, and I would like to fix it. How can I report this?

As a resolution (I don't think I am the first to be affected with this), I would like to propose that AskUbuntu requires the moderator to review down-votes before a users reputation is lost.

I had a 308 reputation about thirty minutes ago, and someone has spontaneously down-voted at least four of my answers, and voted to delete them. I expect that this will happen more, and I would like to fix it. How can I report this?