Internet is slow all of a sudden.

So about 3 weeks ago, and for 2 years before my internet would always download at about 60 kbps, but now it's average speed is 10-20 kbps. I can't think of anything that would cause this. The only thing I've been doing lately is downloading podcasts with Miro. The strange thing is, when I have 4 or more videos downloading with Miro, it downloads at 60 kbps, but if its under 4, its 20. This a weird problem. :confused:

BTW, my modem and computer run through a Linksys wireless router. (They are both wired though.)