Weird Broadband Problems
I have Virgin cable broadband and it routinely delivers 8-10 meg through the wireless network in the (Belkin one about 4 years old). however, every so often it drops down to below 1 meg. It's the same on the ancient desktop, the newer desktop and the laptops. They are all regularly defragged and checked for malware so I'm sure it isn't that but it keeps happening.
I've discovered by connecting the laptop with a cable to the router that it isn't the cable it's the wireless network that's the issue. I've also discovered that connecting in this way seems to clear whatever the problem is and the speed comes right back up again and it's fine on all the computers. It's a safe bet that in a couple of weeks it'll do it again.