The router has been fairly unstable over the last 5 days. It’s firmware has just been updated and everything reconfigured from scratch, but only time will tell if this has solved the problem. According to my ISP the old firmware did have a number of bugs in it – I just think it’s strange that these haven’t cropped up before, but there you go.
On another note, the site will be going down for maintenance right about now, but should be back up again within 15 minutes or so. I need to physically move the server, and thus have to disconnect it.