I spent the last couple of days, and all night tonight trying to figure this out, and finally figured it out. So, I figured that this deserves a blog posting about it.
Let me mention a couple things first to kinda set up the rest of the story. My Internet service is through Clearwire, which is wireless Internet. It works off of towers similar to cellphone towers. Sometime ago, I rearranged my apartment, and moved my router and modem to the other side of the house by the window, because they added a tower to this area. With clearwire, you are supposed to get the best signal by a window; however, this did not used to be the case. Before they added the tower, I got the best signal across the room.
To make a long story short, I had moved my metal filing cabinets over to the window. I have used them as a stand for some parts to my network. I am using a Netgear Router, a Belkin Network USB Hub, and a Western Digital My Book World Edition (w/ a network interface). All the sudden, my wireless router kept dropping signal. Well, I figured out that if you have the router near large metal surfaces, that it can degrade the wireless signal. To solve this problem, I switched my little bookcase with the filing cabinets, and I have had no problems since.