Bit Torrent Issues: Can anyone help me figure out what's what?

Okay, so here's the story. I bought a new Linksys WRT54G router, and I'm hardwired into the router. I like to bit torrent a lot (mostly new anime shows), so I found a guide online about how to do Port Forwarding to open ports up for downloading.

For the first week it's absolutely fantastic. It works right away, and almost everything I download is downloading at 200-300K speeds for just about every file I download. Suddenly this week, it's back down to virtually nothing (5-10K at most) and I can't figure out what happened. I checked my router and the settings are still in place. I haven't installed any new programs, I don't have my Windows Firewall up or any other 3rd party firewall, so I have no idea what gives. Anyone have any ideas as to what could have happened to suddenly kick my download speeds to the toilet?

Oh, and for reference, this ONLY affects my bit torrent. My internet speed is fine for everything else (with the occasional lag).

Jam it back in, in the dark.

When I downloaded Gundam 00 last week, the rate was about 250K, this week it was about 3-4K. I highly doubt that many people dropped the show after one week. :-(

There's nowhere I can't reach.

I never knew that. Looking at the router it has an IP of 192.68.*.*, but when I check the Router status it says 68.***.51.*** (blacking out random numbers for safety). Is this what you mean?

If so, how can I check if my router supports UP&P? When I look at the port forwarding options (set to "both" at the moment) the two in question are TCP and UDP. How would I set something like this up?

This thing is sticky, and I don't like it. I don't appreciate it.

Thank you all for this information. I will do my best to create a static IP for my ports to go to. If it doesn't work, than it's something else I imagine. :-)

Additional Spam:
Sadly it didn't work. It must be something else

Evidence:

http://www.studio-zel.com/images/downloadspeed.jpg

The second torrent is the new Bleach episode that just came out. I just can't seem to get a good connection anymore. Is there something else I may have overlooked? Do both computers on the network need to have static IPs, or just mine?

Most amazing jew boots

What is this I'm downloading exactly? ^^

And right now it's running about the same speed as the others. Hovering around 9k though, so that's a little faster...

I guess it must be something else. Some other setting that I'm missing.

EDIT: I use Charter Broadband internet

I was speaking idiomatically.