I had the same problem with Bittorrent, although it took me a while to figure out what was going on!

I run windows...if I bring up my task manager, it will show me how much memory is being used for each program.

Some programs I run (like Bittorrent or video conversion programs) are very consuming of my computer's memory.

What have I done? I haven't used Bittorrent since. If I do, it will probably be while I sleep.

Good Luck