I recently had a bad thread which has now been deleted (by me).
Since then, I'm getting a pattern of down-votes on really old threads, some of which are greater than 3+ months. I believe this is vote-fraud or whatever we call it on StackExchange.
I'm unsure of how to get a mod's attention other than in meta. I'm fearful of retribution across the network as I value my SO account a lot more than ServerFault.