I'm just tired of the signal pollution, and would like to be able to use karma to honestly appraise the worth of my articles and posts, without seeing 80% of my downvotes come in chunks that correspond precisely to how many posts I've made since the last massive downvote spree.
EDIT to add data points:
Spurious downvoting stopped soon after I named a particular individual (not ALL downvoting stopped, but the downvotes I got all seemed on-the-level.)
One block of potentially spurious downvoting occurred approximately one week ago, but then karma patterns returned to expected levels. I consider this block dubious, because it reasonably matches what I'd expect to see if someone noticed several of my posts together and disagreed with all of them, and did not match the usual pattern of starting with the earliest or latest post that I had made and downvoting everything (it downvoted all posts in a few threads, but not in other threads), so I'm just adding for completeness.
Spurious, indiscriminate downvoting started up again approximately half an hour ago on Sunday (12/1/2013), around noon MDT.
Edit: And now on Tuesday, 12/3/2013, at 10 AM, I'm watching my karma go down again... about 30 points so far.
Edit: And now on Saturday, 12/14/2013, at 2 PM, I'm watching my karma go down again... about 15 points so far, at a rate of about 1-2 points per second.
People have yelled "Admin!" about downvote-abuse before, and so far as I know there is no instance in which any admin has visibly done anything in response.
Perhaps the admins don't care. Perhaps they happen not to have read any of the threads in which this has happened. Perhaps they don't want to encourage LW users to put effort into this sort of meta-issue. Perhaps one or more admins are downvote-abusers.
Whatever the reason(s), I think just shouting "Admin!" won't do much good unless it's accompanied by some kind of reason why an admin should take action, that they mightn't already have thought about and decided wasn't enough.
I think it might be a good idea for admin to get involved now, either to explain what action they'll take or to explain why they're not taking any action. The reasons for admin to get involved are:
1)It makes karma a less effective way of signalling the quality of a user's comments
2)IT seems to have happened to several people
3)It upsets people, and makes them less likely to post here
4)It might cause drama (someone has publicly named a karma abuser below)