Edimax BR-6424n Router not connecting to Modem

Behind the router everything is fine. All systems can connect to each other and communicate, but the router keeps dropping the connection to the modem. I've even reset the router to factory defaults and that won't work, either. I've tried with TTL enabled and disabled but neither work. I've done the "Quick Setup" with the same result. I just can't connect to the modem with my router. At the moment I'm connected by my PC into the modem, which is annoying the hell out of my wife right now as she can't do her internet things that she needs to do. I've tried with the MAC address as all 0s and as a cloned MAC address. I've tried wired and wireless. I think I've honestly tried everything I can think of and nothing is working.

Here are the screenshots showing how it is set up
http://www.phantomta2.pwp.blueyonder.co.uk/1.JPG
http://www.phantomta2.pwp.blueyonder.co.uk/2.JPG
http://www.phantomta2.pwp.blueyonder.co.uk/3.JPG
http://www.phantomta2.pwp.blueyonder.co.uk/4.JPG
http://www.phantomta2.pwp.blueyonder.co.uk/5.JPG

Nice work with screenshots

If the router is on default settings and dropps internet connection but when you conect PC direct to modem it does not drop conection (ruling out ISP issue) 9 times out of 10 it's a damaged router, common cause is overheating.