Take a look at my reputation. I received 9 downvotes in just a matter of a minute or two.
Do you think it is the right behavior for any member?
In the case of serial downvoting (one downvoter who downvotes the same account over and over again), as was said in the other answer, those are usually detected by a script and eventually reversed. Expect such downvotes to be removed and the reputation to be restored.
However, in this case, I wonder if something else might have happened as well. The O.P. was serving a suspension for one week. During that week, their reputation was temporarily set to 1. It's quite possible that, during that week, a few downvotes accumulated on various questions, cast by various members. Then, once the suspension was complete and the reputation restored, those accumulated votes may have been processed by the system, leading to what looked like a rash of downvotes all in one minute, but were in fact an accumulation of downvotes over the course of a week.
That being said, at least some of the downvotes appear to have been reversed already, since at least one of the answers in the screenshot currently has 0 downvotes.
My bottom line recommendations to anyone who sees this kind of anomaly in their reputation:
Don't panic. If the downvotes are cast out of spite, the system usually catches that, and the problem takes care of itself in due time, thanks to an automated script.
Take each downvote with a calm and open mind. Don't assume every downvote is cast because someone is targeting you. Look at each answer and see if there isn't any room for improvement.
Remember that downvotes (and upvotes) are a valuable part of the Stack Exchange system. They allow the community to see which answers are deemed as valuable and useful, and which are not. (Imagine how much less useful and interesting this site would be if every answer to every question had no feedback, and was presented on a level footing with all the other answers!)
Even though it can be frustrating to get an unexplained downvote, don't pitch a fit when you get one. Remember that just one upvote can offset five downvotes. Also, if someone downvotes your answer, you may have lost two rep points, but they also lost one. The system may not be perfect, but, overall, it's well-designed, and the Stack Exchange has thrived under it.
Not everything deserves a meta post.
There's a script at place that reverses this bizarre trend of voting. C'est la vie.
Highly related posts on meta, which suddenly make me tired: