I'll periodically have issues with the site loading, but it's usually when I'm accessing it in the wee hours where I am (2 or 3 AM Eastern US). That's typically when either hosting services or broadband providers will do their server updates, taking down their faster boxes to perfom maintenance, etc.). (Who's up at three AM EST, anyway?? Well, I am, but that's 'cause I work odd hours now.) It's also typically when a lot of places do their bulk data transfers and backups, which can take up a lot of bandwidth as well.

FWIW, I'm using AT&T (non-cable) for broadband.