Hi All
Just to finish this thread off, none of the repairs worked and Bitmain are claiming that I am beyond the 90 days warranty (which I am not). They then sent me a link to buying a new controller board from their shop and it all makes sense. As far as I am concerned Bitmain are sending out dodgy firmware and ignoring their 90day warranty so they can get people to buy more controller boards from them... will not be buying from them again.
When was miner shipped and received? They should live up to 90 day's assuming you bought from them and not reseller or bought off someone else, the warranty does not transfer.
How much is the controller for S7 from them? I'm thinking S3 was like 35 plus shipping or somewhere around there but that has been a long while back.