My best guess at this point is that your videos are being noticed on trending, and some accounts with high stake have decided you are being over rewarded, so they are chopping your payments back.

It doesn't seem to be an attempt to ban you because those same accounts have recently upvoted some fairly similar content - although I don't think they look at anything other than the payouts most of the time.

It sucks, and I hope someone with some serious following or voting power backs you up - at this point not many people will be aware of any of this, but it is the sort of thing that could suddenly become of great interest. Hang in there!