My reputation drastically drowned from 140 to 28. I don't know why. There should be some trace why, when and by whom. I checked the reputation tab. But it does not show any such drowning.
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Your answer to How do I filter a generic list in .Net2.0? was locked and deleted by the Community user 2 days ago. That's a clear sign that it was voted "spam or offensive" enough times to have it removed, which costs you 100 reputation.
Check at http://stackoverflow.com/reputation
You can check which answer/question cause your rep drop, but votes are anonymous, you will not see by whom