That's probably it then. As I've been told in the Network section, wifi signals are at risk of degrading over distance and through/around solid objects such as walls. That makes the speed drop off and if it's a poor signal, it can be unreliable. If it's a consistent signal, you can be reasonably happy with that. Or get one of the new Belkin Pre-N kits, which I'm thinking of using when I get a wireless setup.