Your reference to the thread re: torrents which were not completed due to some components having been deselected is probably the source of my problem. I rarely do that (generally I take the all or nothing approach), but occasionally I have done that in cases when some large files would duplicate those I already have. I suspect that this finally caught up with me. I never look at my profile stats so didn't realize I was accumulating incomplete downloads that were counting towards my 15 leech limit. In future, on those rare occasions when I do opt not to leech all components in a torrent, I will simply stop have to stop the torrent when it shows I have adequately seeded it. Thanks for your reply!
B