My Airport Extreme Dual-Ethernet gets SOOO slow the longer I use it. I just reset it and everything's rather snappy, but by tomorrow it will take eBay a WHOLE MINUTE to respond and begin loading the page! I have to reset it to get my speed back! I'm running 5.5.1 because I heard of problems using any later firmware. I've completely reset to defaults and configured it again but it still wanes after a few hours! What's up?