Yes, I've seen the same thing over the last few days. You'll be sitting at maybe 500K files and 10 TB and suddenly you'll be at 4B files and still 10 TB! Out of curiosity I started killing my connections and you do find that when you kill the right one, your file count drops back to normal. If it's not just a bug, I'd like to find who's doing it so I can filter their address.