Hi
With Amazon you need to go through quite a few steps on their site but eventually you find an option to email them. I've had things replaced under the consumer act long after they claim not to cover stuff, although I don't know if they are liable if it is a reseller, perhaps not or a grey area.
To me it doesn't sound odd it stops after a few weeks of working, this sounds typically like some database corruption or memory leak, it gets to a certain size perhaps then some bad code tries to parse old data or it starts writing over itself due to no memory left and becomes corrupt. This sort of thing has happened with standalone PVRs before now when the guide has grown bigger than it was designed for. Can you remove unused channels from the TV line up? That often trims the guide down and reduces it's foot print. Do you have duplicated channels from another transmitter perhaps? It's a long shot but worth having a look. Auto tuning could see duplicate channels added when whether conditions allow from a distant transmitter and may explain how turning that off helps mitigate the problems.
Good luck with it all.
Regards
Phil
