I find such issues with P2P users in general. They report the stranger issues.
Every few times I start up my computer, Windows says that it must check drive D for consistancy. I have 2 hard drives, C and D, C holding the operating system and programs, and D holding everything else, both NTFS. When the disk is being checked, it fixes some files, and recovers lots of orphaned files. I can tell when it will run the check the next time I restart my computer, because I will try and open a folder, and it will say that the folder is inaccessible. I have run a disk diagnostic from the manufacturer at one of these times, and it reported the C drive had the problem with the file table, which makes sense. The C drive is a 20 GB WD Cavier that is a few years old, and the D drive is a 160GB Seagate Baraccuda that I got for Christmas.
My question is, is the D drive having problems, or is the C drive holding the file table for the D drive having problems? I usually leave the computer on for long hours downloading torrents. Might the torrent client also be responsible?