I have the same problem happening to me (like about 50-100 a day...)

I am also a dj, sharing "mixed" files. Does this have something to do with it? Is it possible for someone to "scramble" the contents of our shared folders, so they don't work?

A month ago, I was averaging about 50 compleated uploads a day, now it is a trickle of about 3 or 4 and a zillion "file not found messages." I think there is something more to this then just the freeloader issue.