Yep this is the third one I've had and it appears this one succumbed to the heat, even after a software reset it kept disconnecting itself (though it remained in sync with the message in the log dev_shutdown)
I've replaced it with a D-Link ADSL2+ modem (in Bridge mode) and a Belkin N300 Wi-Fi router (cost for both 39 quid as opposed to 129) although the wireless isn't as strong but I may just add a range extender somewhere.