After noticing that it took longer than normal to open a file (jpg) in my Home folder, I turned on the Network Monitor and selected some more files, and have internet activity for about 10 seconds each time I access a file. I have noticed this behavior before, but didn't mentally connect it to network ops. After restarting the system, the suspicious activity is gone. I am assuming that someone or something is getting info from my computer without my knowledge. That's scary.
Anyone have any ideas on how to locate the source of this problem?